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diff --git a/doc/gawk.info b/doc/gawk.info index dade486a..1faa775c 100644 --- a/doc/gawk.info +++ b/doc/gawk.info @@ -175,6 +175,7 @@ in (a) below. A copy of the license is included in the section entitled * Computed Regexps:: Using Dynamic Regexps. * GNU Regexp Operators:: Operators specific to GNU software. * Case-sensitivity:: How to do case-insensitive matching. +* Strong Regexp Constants:: Strongly typed regexp constants. * Regexp Summary:: Regular expressions summary. * Records:: Controlling how data is split into records. @@ -217,6 +218,7 @@ in (a) below. A copy of the license is included in the section entitled 'getline'. * Getline Summary:: Summary of 'getline' Variants. * Read Timeout:: Reading input with a timeout. +* Retrying Input:: Retrying input after certain errors. * Command-line directories:: What happens if you put a directory on the command line. * Input Summary:: Input summary. @@ -246,6 +248,7 @@ in (a) below. A copy of the license is included in the section entitled * Special Caveats:: Things to watch out for. * Close Files And Pipes:: Closing Input and Output Files and Pipes. +* Nonfatal:: Enabling Nonfatal Output. * Output Summary:: Output summary. * Output Exercises:: Exercises. * Values:: Constants, Variables, and Regular @@ -557,6 +560,7 @@ in (a) below. A copy of the license is included in the section entitled * Array Functions:: Functions for working with arrays. * Flattening Arrays:: How to flatten arrays. * Creating Arrays:: How to create and populate arrays. +* Redirection API:: How to access and manipulate redirections. * Extension API Variables:: Variables provided by the API. * Extension Versioning:: API Version information. * Extension API Informational Variables:: Variables providing information about @@ -615,6 +619,7 @@ in (a) below. A copy of the license is included in the section entitled * Unix Installation:: Installing 'gawk' under various versions of Unix. * Quick Installation:: Compiling 'gawk' under Unix. +* Shell Startup Files:: Shell convenience functions. * Additional Configuration Options:: Other compile-time options. * Configuration Philosophy:: How it's all supposed to work. * Non-Unix Installation:: Installation on Other Operating @@ -2623,30 +2628,33 @@ The following list describes options mandated by the POSIX standard: '-o'[FILE] '--pretty-print'['='FILE] - Enable pretty-printing of 'awk' programs. By default, the output - program is created in a file named 'awkprof.out' (*note - Profiling::). The optional FILE argument allows you to specify a - different file name for the output. No space is allowed between - the '-o' and FILE, if FILE is supplied. + Enable pretty-printing of 'awk' programs. Implies '--no-optimize'. + By default, the output program is created in a file named + 'awkprof.out' (*note Profiling::). The optional FILE argument + allows you to specify a different file name for the output. No + space is allowed between the '-o' and FILE, if FILE is supplied. - NOTE: Due to the way 'gawk' has evolved, with this option your - program still executes. This will change in the next major - release, such that 'gawk' will only pretty-print the program - and not run it. + NOTE: In the past, this option would also execute your + program. This is no longer the case. '-O' '--optimize' - Enable some optimizations on the internal representation of the - program. At the moment, this includes just simple constant - folding. + Enable 'gawk''s default optimizations on the internal + representation of the program. At the moment, this includes simple + constant folding and tail recursion elimination in function calls. + + These optimizations are enabled by default. This option remains + primarily for backwards compatibility. However, it may be used to + cancel the effect of an earlier '-s' option (see later in this + list). '-p'[FILE] '--profile'['='FILE] - Enable profiling of 'awk' programs (*note Profiling::). By - default, profiles are created in a file named 'awkprof.out'. The - optional FILE argument allows you to specify a different file name - for the profile file. No space is allowed between the '-p' and - FILE, if FILE is supplied. + Enable profiling of 'awk' programs (*note Profiling::). Implies + '--no-optimize'. By default, profiles are created in a file named + 'awkprof.out'. The optional FILE argument allows you to specify a + different file name for the profile file. No space is allowed + between the '-p' and FILE, if FILE is supplied. The profile contains execution counts for each statement in the program in the left margin, and function call counts for each @@ -2660,9 +2668,6 @@ The following list describes options mandated by the POSIX standard: in 'gawk' that are disabled by this option. Also, the following additional restrictions apply: - * Newlines do not act as whitespace to separate fields when 'FS' - is equal to a single space (*note Fields::). - * Newlines are not allowed after '?' or ':' (*note Conditional Exp::). @@ -2683,6 +2688,11 @@ The following list describes options mandated by the POSIX standard: remains (both for backward compatibility and for use in combination with '--traditional'). +'-s' +'--no-optimize' + Disable 'gawk''s default optimizations on the internal + representation of the program. + '-S' '--sandbox' Disable the 'system()' function, input redirections with 'getline', @@ -2931,6 +2941,9 @@ Since '.' is included at the beginning, 'gawk' searches first in the current directory and then in '/usr/local/share/awk'. In practice, this means that you will rarely need to change the value of 'AWKPATH'. + *Note Shell Startup Files::, for information on functions that help +to manipulate the 'AWKPATH' variable. + 'gawk' places the value of the search path that it used into 'ENVIRON["AWKPATH"]'. This provides access to the actual search path value from within an 'awk' program. @@ -2970,6 +2983,9 @@ empty value, 'gawk' uses a default path; this is typically '/usr/local/lib/gawk', although it can vary depending upon how 'gawk' was built. + *Note Shell Startup Files::, for information on functions that help +to manipulate the 'AWKLIBPATH' variable. + 'gawk' places the value of the search path that it used into 'ENVIRON["AWKLIBPATH"]'. This provides access to the actual search path value from within an 'awk' program. @@ -2996,7 +3012,8 @@ used by regular users: 'GAWK_SOCK_RETRIES' Controls the number of times 'gawk' attempts to retry a two-way TCP/IP (socket) connection before giving up. *Note TCP/IP - Networking::. + Networking::. Note that when nonfatal I/O is enabled (*note + Nonfatal::), 'gawk' only tries to open a TCP/IP socket once. 'POSIXLY_CORRECT' Causes 'gawk' to switch to POSIX-compatibility mode, disabling all @@ -3046,13 +3063,6 @@ change. The variables are: supposed to be differences, but occasionally theory and practice don't coordinate with each other.) -'GAWK_NO_PP_RUN' - When 'gawk' is invoked with the '--pretty-print' option, it will - not run the program if this environment variable exists. - - CAUTION: This variable will not survive into the next major - release. - 'GAWK_STACKSIZE' This specifies the amount by which 'gawk' should grow its internal evaluation stack, when needed. @@ -3317,6 +3327,7 @@ you specify more complicated classes of strings. * Computed Regexps:: Using Dynamic Regexps. * GNU Regexp Operators:: Operators specific to GNU software. * Case-sensitivity:: How to do case-insensitive matching. +* Strong Regexp Constants:: Strongly typed regexp constants. * Regexp Summary:: Regular expressions summary. @@ -3443,15 +3454,18 @@ sequences apply to both string constants and regexp constants: '\xHH...' The hexadecimal value HH, where HH stands for a sequence of - hexadecimal digits ('0'-'9', and either 'A'-'F' or 'a'-'f'). Like - the same construct in ISO C, the escape sequence continues until - the first nonhexadecimal digit is seen. (c.e.) However, using - more than two hexadecimal digits produces undefined results. (The - '\x' escape sequence is not allowed in POSIX 'awk'.) - - CAUTION: The next major release of 'gawk' will change, such - that a maximum of two hexadecimal digits following the '\x' - will be used. + hexadecimal digits ('0'-'9', and either 'A'-'F' or 'a'-'f'). A + maximum of two digts are allowed after the '\x'. Any further + hexadecimal digits are treated as simple letters or numbers. + (c.e.) (The '\x' escape sequence is not allowed in POSIX awk.) + + CAUTION: In ISO C, the escape sequence continues until the + first nonhexadecimal digit is seen. For many years, 'gawk' + would continue incorporating hexadecimal digits into the value + until a non-hexadecimal digit or the end of the string was + encountered. However, using more than two hexadecimal digits + produced undefined results. As of version 4.2, only two + digits are processed. '\/' A literal slash (necessary for regexp constants only). This @@ -4028,7 +4042,7 @@ No options default. -File: gawk.info, Node: Case-sensitivity, Next: Regexp Summary, Prev: GNU Regexp Operators, Up: Regexp +File: gawk.info, Node: Case-sensitivity, Next: Strong Regexp Constants, Prev: GNU Regexp Operators, Up: Regexp 3.8 Case Sensitivity in Matching ================================ @@ -4102,10 +4116,29 @@ and we don't recommend it. that 'gawk' does the right thing. -File: gawk.info, Node: Regexp Summary, Prev: Case-sensitivity, Up: Regexp +File: gawk.info, Node: Strong Regexp Constants, Next: Regexp Summary, Prev: Case-sensitivity, Up: Regexp -3.9 Summary -=========== +3.9 Strongly Typed Regexp Constants +=================================== + +This minor node describes a 'gawk'-specific feature. + + Regexp constants ('/.../') hold a strange position in the 'awk' +language. In most contexts, they act like an expression: '$0 ~ /.../'. +In other contexts, they denote only a regexp to be matched. In no case +are they really a "first class citizen" of the language. That is, you +cannot define a scalar variable whose type is "regexp" in the same sense +that you can define a variable to be a number or a string: + + num = 42 Numeric variable + str = "hi" String variable + re = /foo/ Wrong! re is the result of $0 ~ /foo/ + + +File: gawk.info, Node: Regexp Summary, Prev: Strong Regexp Constants, Up: Regexp + +3.10 Summary +============ * Regular expressions describe sets of strings to be matched. In 'awk', regular expression constants are written enclosed between @@ -4176,6 +4209,7 @@ be named on the 'awk' command line (*note Getline::). * Getline:: Reading files under explicit program control using the 'getline' function. * Read Timeout:: Reading input with a timeout. +* Retrying Input:: Retrying input after certain errors. * Command-line directories:: What happens if you put a directory on the command line. * Input Summary:: Input summary. @@ -4437,7 +4471,7 @@ When 'awk' reads an input record, the record is automatically "parsed" or separated by the 'awk' utility into chunks called "fields". By default, fields are separated by "whitespace", like words in a line. Whitespace in 'awk' means any string of one or more spaces, TABs, or -newlines;(1) other characters that are considered whitespace by other +newlines; other characters that are considered whitespace by other languages (such as formfeed, vertical tab, etc.) are _not_ considered whitespace by 'awk'. @@ -4489,11 +4523,6 @@ record: -| Julie F -| Samuel A - ---------- Footnotes ---------- - - (1) In POSIX 'awk', newlines are not considered whitespace for -separating fields. - File: gawk.info, Node: Nonconstant Fields, Next: Changing Fields, Prev: Fields, Up: Reading Files @@ -5439,6 +5468,11 @@ record, such as a file that cannot be opened, then 'getline' returns -1. In this case, 'gawk' sets the variable 'ERRNO' to a string describing the error that occurred. + If 'ERRNO' indicates that the I/O operation may be retried, and +'PROCINFO["INPUT", "RETRY"]' is set, then 'getline' returns -2 instead +of -1, and further calls to 'getline' may be attempted. *Note Retrying +Input:: for further information about this feature. + In the following examples, COMMAND stands for a string value that represents a shell command. @@ -5874,7 +5908,7 @@ VAR Table 4.1: 'getline' variants and what they set -File: gawk.info, Node: Read Timeout, Next: Command-line directories, Prev: Getline, Up: Reading Files +File: gawk.info, Node: Read Timeout, Next: Retrying Input, Prev: Getline, Up: Reading Files 4.10 Reading Input with a Timeout ================================= @@ -5953,7 +5987,8 @@ per-command or per-connection basis. 'gawk' considers a timeout event to be an error even though the attempt to read from the underlying device may succeed in a later attempt. This is a limitation, and it also means that you cannot use -this to multiplex input from two or more sources. +this to multiplex input from two or more sources. *Note Retrying +Input:: for a way to enable later I/O attempts to succeed. Assigning a timeout value prevents read operations from blocking indefinitely. But bear in mind that there are other ways 'gawk' can @@ -5967,9 +6002,36 @@ can block indefinitely until some other process opens it for writing. (1) This assumes that standard input is the keyboard. -File: gawk.info, Node: Command-line directories, Next: Input Summary, Prev: Read Timeout, Up: Reading Files +File: gawk.info, Node: Retrying Input, Next: Command-line directories, Prev: Read Timeout, Up: Reading Files -4.11 Directories on the Command Line +4.11 Retrying Reads After Certain Input Errors +============================================== + +This minor node describes a feature that is specific to 'gawk'. + + When 'gawk' encounters an error while reading input, by default +'getline' returns -1, and subsequent attempts to read from that file +result in an end-of-file indication. However, you may optionally +instruct 'gawk' to allow I/O to be retried when certain errors are +encountered by setting a special element in the 'PROCINFO' array (*note +Auto-set::): + + PROCINFO["INPUT_NAME", "RETRY"] = 1 + + When this element exists, 'gawk' checks the value of the system (C +language) 'errno' variable when an I/O error occurs. If 'errno' +indicates a subsequent I/O attempt may succeed, 'getline' instead +returns -2 and further calls to 'getline' may succeed. This applies to +the 'errno' values 'EAGAIN', 'EWOULDBLOCK', 'EINTR', or 'ETIMEDOUT'. + + This feature is useful in conjunction with 'PROCINFO["INPUT_NAME", +"READ_TIMEOUT"]' or situations where a file descriptor has been +configured to behave in a non-blocking fashion. + + +File: gawk.info, Node: Command-line directories, Next: Input Summary, Prev: Retrying Input, Up: Reading Files + +4.12 Directories on the Command Line ==================================== According to the POSIX standard, files named on the 'awk' command line @@ -5992,7 +6054,7 @@ usable data from an 'awk' program. File: gawk.info, Node: Input Summary, Next: Input Exercises, Prev: Command-line directories, Up: Reading Files -4.12 Summary +4.13 Summary ============ * Input is split into records based on the value of 'RS'. The @@ -6064,7 +6126,7 @@ File: gawk.info, Node: Input Summary, Next: Input Exercises, Prev: Command-li File: gawk.info, Node: Input Exercises, Prev: Input Summary, Up: Reading Files -4.13 Exercises +4.14 Exercises ============== 1. Using the 'FIELDWIDTHS' variable (*note Constant Size::), write a @@ -6114,6 +6176,7 @@ function. 'gawk' allows access to inherited file descriptors. * Close Files And Pipes:: Closing Input and Output Files and Pipes. +* Nonfatal:: Enabling Nonfatal Output. * Output Summary:: Output summary. * Output Exercises:: Exercises. @@ -7021,7 +7084,7 @@ that 'gawk' provides: behavior. -File: gawk.info, Node: Close Files And Pipes, Next: Output Summary, Prev: Special Files, Up: Printing +File: gawk.info, Node: Close Files And Pipes, Next: Nonfatal, Prev: Special Files, Up: Printing 5.9 Closing Input and Output Redirections ========================================= @@ -7166,11 +7229,23 @@ there is a system problem closing the file or process. In these cases, 'gawk' sets the predefined variable 'ERRNO' to a string describing the problem. - In 'gawk', when closing a pipe or coprocess (input or output), the -return value is the exit status of the command.(2) Otherwise, it is the -return value from the system's 'close()' or 'fclose()' C functions when -closing input or output files, respectively. This value is zero if the -close succeeds, or -1 if it fails. + In 'gawk', starting with version 4.2, when closing a pipe or +coprocess (input or output), the return value is the exit status of the +command, as described in *note Table 5.1: +table-close-pipe-return-values.(2) Otherwise, it is the return value +from the system's 'close()' or 'fclose()' C functions when closing input +or output files, respectively. This value is zero if the close +succeeds, or -1 if it fails. + +Situation Return value from 'close()' +-------------------------------------------------------------------------- +Normal exit of command Command's exit status +Death by signal of command 256 + number of murderous signal +Death by signal of command 512 + number of murderous signal +with core dump +Some kind of error -1 + +Table 5.1: Return values from 'close()' of a pipe The POSIX standard is very vague; it says that 'close()' returns zero on success and a nonzero value otherwise. In general, different @@ -7184,14 +7259,73 @@ Options::), 'gawk' just returns zero when closing a pipe. is called a "zombie," and cleaning up after it is referred to as "reaping." - (2) This is a full 16-bit value as returned by the 'wait()' system -call. See the system manual pages for information on how to decode this -value. + (2) Prior to version 4.2, the return value from closing a pipe or +co-process was the full 16-bit exit value as defined by the 'wait()' +system call. -File: gawk.info, Node: Output Summary, Next: Output Exercises, Prev: Close Files And Pipes, Up: Printing +File: gawk.info, Node: Nonfatal, Next: Output Summary, Prev: Close Files And Pipes, Up: Printing + +5.10 Enabling Nonfatal Output +============================= + +This minor node describes a 'gawk'-specific feature. + + In standard 'awk', output with 'print' or 'printf' to a nonexistent +file, or some other I/O error (such as filling up the disk) is a fatal +error. + + $ gawk 'BEGIN { print "hi" > "/no/such/file" }' + error-> gawk: cmd. line:1: fatal: can't redirect to `/no/such/file' (No such file or directory) + + 'gawk' makes it possible to detect that an error has occurred, +allowing you to possibly recover from the error, or at least print an +error message of your choosing before exiting. You can do this in one +of two ways: + + * For all output files, by assigning any value to + 'PROCINFO["NONFATAL"]'. -5.10 Summary + * On a per-file basis, by assigning any value to 'PROCINFO[FILENAME, + "NONFATAL"]'. Here, FILENAME is the name of the file to which you + wish output to be nonfatal. + + Once you have enabled nonfatal output, you must check 'ERRNO' after +every relevant 'print' or 'printf' statement to see if something went +wrong. It is also a good idea to initialize 'ERRNO' to zero before +attempting the output. For example: + + $ gawk ' + > BEGIN { + > PROCINFO["NONFATAL"] = 1 + > ERRNO = 0 + > print "hi" > "/no/such/file" + > if (ERRNO) { + > print("Output failed:", ERRNO) > "/dev/stderr" + > exit 1 + > } + > }' + error-> Output failed: No such file or directory + + Here, 'gawk' did not produce a fatal error; instead it let the 'awk' +program code detect the problem and handle it. + + This mechanism works also for standard output and standard error. +For standard output, you may use 'PROCINFO["-", "NONFATAL"]' or +'PROCINFO["/dev/stdout", "NONFATAL"]'. For standard error, use +'PROCINFO["/dev/stderr", "NONFATAL"]'. + + When attempting to open a TCP/IP socket (*note TCP/IP Networking::), +'gawk' tries multiple times. The 'GAWK_SOCK_RETRIES' environment +variable (*note Other Environment Variables::) allows you to override +'gawk''s builtin default number of attempts. However, once nonfatal I/O +is enabled for a given socket, 'gawk' only retries once, relying on +'awk'-level code to notice that there was a problem. + + +File: gawk.info, Node: Output Summary, Next: Output Exercises, Prev: Nonfatal, Up: Printing + +5.11 Summary ============ * The 'print' statement prints comma-separated expressions. Each @@ -7213,10 +7347,15 @@ File: gawk.info, Node: Output Summary, Next: Output Exercises, Prev: Close Fi For coprocesses, it is possible to close only one direction of the communications. + * Normally errors with 'print' or 'printf' are fatal. 'gawk' lets + you make output errors be nonfatal either for all files or on a + per-file basis. You must then check for errors after every + relevant output statement. + File: gawk.info, Node: Output Exercises, Prev: Output Summary, Up: Printing -5.11 Exercises +5.12 Exercises ============== 1. Rewrite the program: @@ -8474,18 +8613,18 @@ Constant Regexps::, where this is discussed in more detail. File: gawk.info, Node: POSIX String Comparison, Prev: Comparison Operators, Up: Typing and Comparison -6.3.2.3 String Comparison with POSIX Rules -.......................................... +6.3.2.3 String Comparison Based on Locale Collating Order +......................................................... -The POSIX standard says that string comparison is performed based on the -locale's "collating order". This is the order in which characters sort, -as defined by the locale (for more discussion, *note Locales::). This -order is usually very different from the results obtained when doing -straight character-by-character comparison.(1) +The POSIX standard used to say that all string comparisons are performed +based on the locale's "collating order". This is the order in which +characters sort, as defined by the locale (for more discussion, *note +Locales::). This order is usually very different from the results +obtained when doing straight byte-by-byte comparison.(1) Because this behavior differs considerably from existing practice, -'gawk' only implements it when in POSIX mode (*note Options::). Here is -an example to illustrate the difference, in an 'en_US.UTF-8' locale: +'gawk' only implemented it when in POSIX mode (*note Options::). Here +is an example to illustrate the difference, in an 'en_US.UTF-8' locale: $ gawk 'BEGIN { printf("ABC < abc = %s\n", > ("ABC" < "abc" ? "TRUE" : "FALSE")) }' @@ -8494,11 +8633,28 @@ an example to illustrate the difference, in an 'en_US.UTF-8' locale: > ("ABC" < "abc" ? "TRUE" : "FALSE")) }' -| ABC < abc = FALSE + Fortunately, as of August 2016, comparison based on locale collating +order is no longer required for the '==' and '!=' operators.(2) +However, comparison based on locales is still required for '<', '<=', +'>', and '>='. POSIX thus recommends as follows: + + Since the '==' operator checks whether strings are identical, not + whether they collate equally, applications needing to check whether + strings collate equally can use: + + a <= b && a >= b + + As of version 4.2, 'gawk' continues to use locale collating order for +'<', '<=', '>', and '>=' only in POSIX mode. + ---------- Footnotes ---------- (1) Technically, string comparison is supposed to behave the same way as if the strings were compared with the C 'strcoll()' function. + (2) See the Austin Group website +(http://austingroupbugs.net/view.php?id=1070). + File: gawk.info, Node: Boolean Ops, Next: Conditional Exp, Prev: Typing and Comparison, Up: Truth Values and Conditions @@ -10136,7 +10292,7 @@ each variable.) The default value is '" "', a string consisting of a single space. As a special exception, this value means that any sequence of - spaces, TABs, and/or newlines is a single separator.(1) It also + spaces, TABs, and/or newlines is a single separator. It also causes spaces, TABs, and newlines at the beginning and end of a record to be ignored. @@ -10233,10 +10389,6 @@ each variable.) Internationalization::). The default value of 'TEXTDOMAIN' is '"messages"'. - ---------- Footnotes ---------- - - (1) In POSIX 'awk', newline does not count as whitespace. - File: gawk.info, Node: Auto-set, Next: ARGC and ARGV, Prev: User-modified, Up: Built-in Variables @@ -10300,10 +10452,24 @@ they are not special: An associative array containing the values of the environment. The array indices are the environment variable names; the elements are the values of the particular environment variables. For example, - 'ENVIRON["HOME"]' might be '"/home/arnold"'. Changing this array - does not affect the environment passed on to any programs that - 'awk' may spawn via redirection or the 'system()' function. (In a - future version of 'gawk', it may do so.) + 'ENVIRON["HOME"]' might be '/home/arnold'. + + For POSIX 'awk', changing this array does not affect the + environment passed on to any programs that 'awk' may spawn via + redirection or the 'system()' function. + + However, beginning with version 4.2, if not in POSIX compatibility + mode, 'gawk' does update its own environment when 'ENVIRON' is + changed, thus changing the environment seen by programs that it + creates. You should therefore be especially careful if you modify + 'ENVIRON["PATH"]', which is the search path for finding executable + programs. + + This can also affect the running 'gawk' program, since some of the + built-in functions may pay attention to certain environment + variables. The most notable instance of this is 'mktime()' (*note + Time Functions::), which pays attention the value of the 'TZ' + environment variable on many systems. Some operating systems may not have environment variables. On such systems, the 'ENVIRON' array is empty (except for @@ -10326,6 +10492,11 @@ they are not special: 'getline' returning -1. You are, of course, free to clear it yourself before doing an I/O operation. + If the value of 'ERRNO' corresponds to a system error in the C + 'errno' variable, then 'PROCINFO["errno"]' will be set to the value + of 'errno'. For non-system errors, 'PROCINFO["errno"]' will be + zero. + 'FILENAME' The name of the current input file. When no data files are listed on the command line, 'awk' reads from the standard input and @@ -10374,6 +10545,10 @@ they are not special: 'PROCINFO["egid"]' The value of the 'getegid()' system call. + 'PROCINFO["errno"]' + The value of the C 'errno' variable when 'ERRNO' is set to the + associated error message. + 'PROCINFO["euid"]' The value of the 'geteuid()' system call. @@ -10472,6 +10647,14 @@ they are not special: The following elements allow you to change 'gawk''s behavior: + 'PROCINFO["NONFATAL"]' + If this element exists, then I/O errors for all output + redirections become nonfatal. *Note Nonfatal::. + + 'PROCINFO["OUTPUT_NAME", "NONFATAL"]' + Make output errors for OUTPUT_NAME be nonfatal. *Note + Nonfatal::. + 'PROCINFO["COMMAND", "pty"]' For two-way communication to COMMAND, use a pseudo-tty instead of setting up a two-way pipe. *Note Two-way I/O:: for more @@ -11886,6 +12069,21 @@ brackets ([ ]): truncated toward zero. For example, 'int(3)' is 3, 'int(3.9)' is 3, 'int(-3.9)' is -3, and 'int(-3)' is -3 as well. +'intdiv(NUMERATOR, DENOMINATOR, RESULT)' + Perform integer division, similar to the standard C function of the + same name. First, truncate 'numerator' and 'denominator' towards + zero, creating integer values. Clear the 'result' array, and then + set 'result["quotient"]' to the result of 'numerator / + denominator', truncated towards zero to an integer, and set + 'result["remainder"]' to the result of 'numerator % denominator', + truncated towards zero to an integer. This function is primarily + intended for use with arbitrary length integers; it avoids creating + MPFR arbitrary precision floating-point values (*note Arbitrary + Precision Integers::). + + This function is a 'gawk' extension. It is not available in + compatibility mode (*note Options::). + 'log(X)' Return the natural logarithm of X, if X is positive; otherwise, return 'NaN' ("not a number") on IEEE 754 systems. Additionally, @@ -13353,14 +13551,52 @@ File: gawk.info, Node: Type Functions, Next: I18N Functions, Prev: Bitwise Fu 9.1.7 Getting Type Information ------------------------------ -'gawk' provides a single function that lets you distinguish an array -from a scalar variable. This is necessary for writing code that -traverses every element of an array of arrays (*note Arrays of -Arrays::). +'gawk' provides two functions that lets you distinguish the type of a +variable. This is necessary for writing code that traverses every +element of an array of arrays (*note Arrays of Arrays::), and in other +contexts. 'isarray(X)' Return a true value if X is an array. Otherwise, return false. +'typeof(X)' + Return one of the following strings, depending upon the type of X: + + '"array"' + X is an array. + + '"number"' + X is a number. + + '"string"' + X is a string. + + '"strnum"' + X is a string that might be a number, such as a field or the + result of calling 'split()'. (I.e., X has the STRNUM + attribute; *note Variable Typing::.) + + '"unassigned"' + X is a scalar variable that has not been assigned a value yet. + For example: + + BEGIN { + a[1] # creates a[1] but it has no assigned value + print typeof(a[1]) # scalar_u + } + + '"untyped"' + X has not yet been used yet at all; it can become a scalar or + an array. For example: + + BEGIN { + print typeof(x) # x never used --> untyped + mk_arr(x) + print typeof(x) # x now an array --> array + } + + function mk_arr(a) { a[1] = 1 } + 'isarray()' is meant for use in two circumstances. The first is when traversing a multidimensional array: you can test if an element is itself an array or not. The second is inside the body of a user-defined @@ -13374,6 +13610,13 @@ parameter is an array or not. that has not been previously used to 'isarray()', 'gawk' ends up turning it into a scalar. + The 'typeof()' function is general; it allows you to determine if a +variable or function parameter is a scalar, an array. + + 'isarray()' is deprecated; you should use 'typeof()' instead. You +should replace any existing uses of 'isarray(var)' in your code with +'typeof(var) == "array"'. + File: gawk.info, Node: I18N Functions, Prev: Type Functions, Up: Built-in @@ -19689,9 +19932,15 @@ case 'gawk' waits for the child process to exit, which may cause your program to hang. (Thus, this particular feature is of much less use in practice than being able to close the '"to"' end.) - CAUTION: It is a fatal error to write to the '"to"' end of a - two-way pipe which has been closed. It is also a fatal error to - read from the '"from"' end of a two-way pipe that has been closed. + CAUTION: Normally, it is a fatal error to write to the '"to"' end + of a two-way pipe which has been closed, and it is also a fatal + error to read from the '"from"' end of a two-way pipe that has been + closed. + + You may set 'PROCINFO["COMMAND", "NONFATAL"]' to make such + operations become nonfatal, in which case you then need to check + 'ERRNO' after each 'print', 'printf', or 'getline'. *Note + Nonfatal::, for more information. You may also use pseudo-ttys (ptys) for two-way communication instead of pipes, if your system supports them. This is done on a per-command @@ -19979,8 +20228,7 @@ output. They are as follows: you typed when you wrote it. This is because 'gawk' creates the profiled version by "pretty-printing" its internal representation of the program. The advantage to this is that 'gawk' can produce a standard -representation. The disadvantage is that all source code comments are -lost. Also, things such as: +representation. Also, things such as: /foo/ @@ -20039,8 +20287,36 @@ the 'Ctrl-\' key. called this way, 'gawk' "pretty-prints" the program into 'awkprof.out', without any execution counts. - NOTE: The '--pretty-print' option still runs your program. This - will change in the next major release. + NOTE: Once upon a time, the '--pretty-print' option would also run + your program. This is is no longer the case. + + There is a significant difference between the output created when +profiling, and that created when pretty-printing. Pretty-printed output +preserves the original comments that were in the program, although their +placement may not correspond exactly to their original locations in the +source code.(1) + + However, as a deliberate design decision, profiling output _omits_ +the original program's comments. This allows you to focus on the +execution count data and helps you avoid the temptation to use the +profiler for pretty-printing. + + Additionally, pretty-printed output does not have the leading +indentation that the profiling output does. This makes it easy to +pretty-print your code once development is completed, and then use the +result as the final version of your program. + + Because the internal representation of your program is formatted to +recreate an 'awk' program, profiling and pretty-printing automatically +disable 'gawk''s default optimizations. + + ---------- Footnotes ---------- + + (1) 'gawk' does the best it can to preserve the distinction between +comments at the end of a statement and comments on lines by themselves. +Due to implementation constraints, it does not always do so correctly, +particularly for 'switch' statements. The 'gawk' maintainers hope to +improve this in a subsequent release. File: gawk.info, Node: Advanced Features Summary, Prev: Profiling, Up: Advanced Features @@ -20081,8 +20357,7 @@ File: gawk.info, Node: Advanced Features Summary, Prev: Profiling, Up: Advanc 'USR1' signal while profiling causes 'gawk' to dump the profile and keep going, including a function call stack. - * You can also just "pretty-print" the program. This currently also - runs the program, but that will change in the next major release. + * You can also just "pretty-print" the program. File: gawk.info, Node: Internationalization, Next: Debugger, Prev: Advanced Features, Up: Top @@ -21777,6 +22052,62 @@ some limitations. A few that it's worth being aware of are: * The 'gawk' debugger only accepts source code supplied with the '-f' option. + One other point is worth discussing. Conventional debuggers run in a +separate process (and thus address space) from the programs that they +debug (the "debuggee", if you will). + + The 'gawk' debugger is different; it is an integrated part of 'gawk' +itself. This makes it possible, in rare cases, for 'gawk' to become an +excellent demonstrator of Heisenberg Uncertainty physics, where the mere +act of observing something can change it. Consider the following:(1) + + $ cat test.awk + -| { print typeof($1), typeof($2) } + $ cat test.data + -| abc 123 + $ gawk -f test.awk test.data + -| strnum strnum + + This is all as expected: field data has the STRNUM attribute (*note +Variable Typing::). Now watch what happens when we run this program +under the debugger: + + $ gawk -D -f test.awk test.data + gawk> w $1 Set watchpoint on $1 + -| Watchpoint 1: $1 + gawk> w $2 Set watchpoint on $2 + -| Watchpoint 2: $2 + gawk> r Start the program + -| Starting program: + -| Stopping in Rule ... + -| Watchpoint 1: $1 Watchpoint fires + -| Old value: "" + -| New value: "abc" + -| main() at `test.awk':1 + -| 1 { print typeof($1), typeof($2) } + gawk> n Keep going ... + -| Watchpoint 2: $2 Watchpoint fires + -| Old value: "" + -| New value: "123" + -| main() at `test.awk':1 + -| 1 { print typeof($1), typeof($2) } + gawk> n Get result from typeof() + -| strnum number Result for $2 isn't right + -| Program exited normally with exit value: 0 + gawk> quit + + In this case, the act of comparing the new value of '$2' with the old +one caused 'gawk' to evaluate it and determine that it is indeed a +number, and this is reflected in the result of 'typeof()'. + + Cases like this where the debugger is not transparent to the +program's execution should be rare. If you encounter one, please report +it (*note Bugs::). + + ---------- Footnotes ---------- + + (1) Thanks to Hermann Peifer for this example. + File: gawk.info, Node: Debugging Summary, Prev: Limitations, Up: Debugger @@ -21805,6 +22136,9 @@ File: gawk.info, Node: Debugging Summary, Prev: Limitations, Up: Debugger it is used by the debugger to provide command-line history and editing. + * Usually, the debugger does not not affect the program being + debugged, but occasionally it can. + File: gawk.info, Node: Arbitrary Precision Arithmetic, Next: Dynamic Extensions, Prev: Debugger, Up: Top @@ -22538,6 +22872,62 @@ the following: gawk -M 'BEGIN { n = 13; print n % 2 }' + When dividing two arbitrary precision integers with either '/' or +'%', the result is typically an arbitrary precision floating point value +(unless the denominator evenly divides into the numerator). In order to +do integer division or remainder with arbitrary precision integers, use +the built-in 'intdiv()' function (*note Numeric Functions::). + + You can simulate the 'intdiv()' function in standard 'awk' using this +user-defined function: + + # intdiv --- do integer division + + function intdiv(numerator, denominator, result) + { + split("", result) + + numerator = int(numerator) + denominator = int(denominator) + result["quotient"] = int(numerator / denominator) + result["remainder"] = int(numerator % denominator) + + return 0.0 + } + + The following example program, contributed by Katie Wasserman, uses +'intdiv()' to compute the digits of pi to as many places as you choose +to set: + + # pi.awk --- compute the digits of pi + + BEGIN { + digits = 100000 + two = 2 * 10 ^ digits + pi = two + for (m = digits * 4; m > 0; --m) { + d = m * 2 + 1 + x = pi * m + intdiv(x, d, result) + pi = result["quotient"] + pi = pi + two + } + print pi + } + + When asked about the algorithm used, Katie replied: + + It's not that well known but it's not that obscure either. It's + Euler's modification to Newton's method for calculating pi. Take a + look at lines (23) - (25) here: + <http://mathworld.wolfram.com/PiFormulas.html>. + + The algorithm I wrote simply expands the multiply by 2 and works + from the innermost expression outwards. I used this to program HP + calculators because it's quite easy to modify for tiny memory + devices with smallish word sizes. See + <http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=899>. + ---------- Footnotes ---------- (1) Weisstein, Eric W. 'Sylvester's Sequence'. From MathWorld--A @@ -22900,6 +23290,7 @@ API in detail. * Symbol Table Access:: Functions for accessing global variables. * Array Manipulation:: Functions for working with arrays. +* Redirection API:: How to access and manipulate redirections. * Extension API Variables:: Variables provided by the API. * Extension API Boilerplate:: Boilerplate code for using the API. @@ -22955,6 +23346,8 @@ operations: - Flattening an array for easy C-style looping over all its indices and elements + * Accessing and manipulating redirections. + Some points about using the API: * The following types, macros, and/or functions are referenced in @@ -23312,7 +23705,7 @@ Extension functions are described by the following record: typedef struct awk_ext_func { const char *name; awk_value_t *(*function)(int num_actual_args, awk_value_t *result); - size_t num_expected_args; + size_t max_expected_args; } awk_ext_func_t; The fields are: @@ -23339,11 +23732,17 @@ Extension functions are described by the following record: The function must return the value of 'result'. This is for the convenience of the calling code inside 'gawk'. -'size_t num_expected_args;' - This is the number of arguments the function expects to receive. - Each extension function may decide what to do if the number of - arguments isn't what it expected. As with real 'awk' functions, it - is likely OK to ignore extra arguments. +'size_t max_expected_args;' + This is the maximum number of arguments the function expects to + receive. Each extension function may decide what to do if the + number of arguments isn't what it expected. As with real 'awk' + functions, it is likely OK to ignore extra arguments. This value + does not affect actual program execution. + + Extension functions should compare this value to the number of + actual arguments passed and possibly issue a lint warning if there + is an undesirable mismatch. Of course, if '--lint=fatal' is used, + this would cause the program to exit. Once you have a record representing your extension function, you register it with 'gawk' using this API function: @@ -23796,6 +24195,9 @@ extension ID received from 'gawk' when the extension was loaded:(1) 'void fatal(awk_ext_id_t id, const char *format, ...);' Print a message and then cause 'gawk' to exit immediately. +'void nonfatal(awk_ext_id_t id, const char *format, ...);' + Print a nonfatal error message. + 'void warning(awk_ext_id_t id, const char *format, ...);' Print a warning message. @@ -24160,7 +24562,7 @@ using 'release_value()'. 'double' to store. -File: gawk.info, Node: Array Manipulation, Next: Extension API Variables, Prev: Symbol Table Access, Up: Extension API Description +File: gawk.info, Node: Array Manipulation, Next: Redirection API, Prev: Symbol Table Access, Up: Extension API Description 16.4.11 Array Manipulation -------------------------- @@ -24644,9 +25046,78 @@ array: environment variable.) -File: gawk.info, Node: Extension API Variables, Next: Extension API Boilerplate, Prev: Array Manipulation, Up: Extension API Description +File: gawk.info, Node: Redirection API, Next: Extension API Variables, Prev: Array Manipulation, Up: Extension API Description + +16.4.12 Accessing and Manipulating Redirections +----------------------------------------------- + +The following function allows extensions to access and manipulate +redirections. + +'awk_bool_t get_file(const char *name,' +' size_t name_len,' +' const char *filetype,' +' int fd,' +' const awk_input_buf_t **ibufp,' +' const awk_output_buf_t **obufp);' + Look up a file in 'gawk''s internal redirection table. If 'name' + is 'NULL' or 'name_len' is zero, return data for the currently open + input file corresponding to 'FILENAME'. (This does not access the + 'filetype' argument, so that may be undefined). If the file is not + already open, attempt to open it. The 'filetype' argument must be + zero-terminated and should be one of: + + '">"' + A file opened for output. + + '">>"' + A file opened for append. + + '"<"' + A file opened for input. + + '"|>"' + A pipe opened for output. + + '"|<"' + A pipe opened for input. + + '"|&"' + A two-way coprocess. + + On error, return a 'false' value. Otherwise, return 'true', and + return additional information about the redirection in the 'ibufp' + and 'obufp' pointers. For input redirections, the '*ibufp' value + should be non-'NULL', and '*obufp' should be 'NULL'. For output + redirections, the '*obufp' value should be non-'NULL', and '*ibufp' + should be 'NULL'. For two-way coprocesses, both values should be + non-'NULL'. + + In the usual case, the extension is interested in '(*ibufp)->fd' + and/or 'fileno((*obufp)->fp)'. If the file is not already open, + and the 'fd' argument is non-negative, 'gawk' will use that file + descriptor instead of opening the file in the usual way. If 'fd' + is non-negative, but the file exists already, 'gawk' ignores 'fd' + and returns the existing file. It is the caller's responsibility + to notice that neither the 'fd' in the returned 'awk_input_buf_t' + nor the 'fd' in the returned 'awk_output_buf_t' matches the + requested value. + + Note that supplying a file descriptor is currently _not_ supported + for pipes. However, supplying a file descriptor should work for + input, output, append, and two-way (coprocess) sockets. If + 'filetype' is two-way, 'gawk' assumes that it is a socket! Note + that in the two-way case, the input and output file descriptors may + differ. To check for success, you must check whether either + matches. + + It is anticipated that this API function will be used to implement +I/O multiplexing and a socket library. + + +File: gawk.info, Node: Extension API Variables, Next: Extension API Boilerplate, Prev: Redirection API, Up: Extension API Description -16.4.12 API Variables +16.4.13 API Variables --------------------- The API provides two sets of variables. The first provides information @@ -24663,7 +25134,7 @@ information about how 'gawk' was invoked. File: gawk.info, Node: Extension Versioning, Next: Extension API Informational Variables, Up: Extension API Variables -16.4.12.1 API Version Constants and Variables +16.4.13.1 API Version Constants and Variables ............................................. The API provides both a "major" and a "minor" version number. The API @@ -24715,7 +25186,7 @@ Boilerplate::). File: gawk.info, Node: Extension API Informational Variables, Prev: Extension Versioning, Up: Extension API Variables -16.4.12.2 Informational Variables +16.4.13.2 Informational Variables ................................. The API provides access to several variables that describe whether the @@ -24750,7 +25221,7 @@ change during execution. File: gawk.info, Node: Extension API Boilerplate, Prev: Extension API Variables, Up: Extension API Description -16.4.13 Boilerplate Code +16.4.14 Boilerplate Code ------------------------ As mentioned earlier (*note Extension Mechanism Outline::), the function @@ -26078,15 +26549,17 @@ project. * GD graphics library extension + * MPFR library extension (this provides access to a number of MPFR + functions that 'gawk''s native MPFR support does not) + * PDF extension * PostgreSQL extension - * MPFR library extension (this provides access to a number of MPFR - functions that 'gawk''s native MPFR support does not) - * Redis extension + * Select extension + * XML parser extension, using the Expat (http://expat.sourceforge.net) XML parsing library @@ -26164,7 +26637,7 @@ File: gawk.info, Node: Extension summary, Next: Extension Exercises, Prev: ga exit callbacks, a version string, input parsers, output wrappers, and two-way processors) - * Printing fatal, warning, and "lint" warning messages + * Printing fatal, nonfatal, warning, and "lint" warning messages * Updating 'ERRNO', or unsetting it @@ -26499,6 +26972,9 @@ current version of 'gawk'. - Directories on the command line produce a warning and are skipped (*note Command-line directories::) + - Output with 'print' and 'printf' need not be fatal (*note + Nonfatal::) + * New keywords: - The 'BEGINFILE' and 'ENDFILE' special patterns (*note @@ -26548,6 +27024,9 @@ current version of 'gawk'. - The 'bindtextdomain()', 'dcgettext()', and 'dcngettext()' functions for internationalization (*note Programmer i18n::) + - The 'intdiv()' function for doing integer division and + remainder (*note Numeric Functions::) + * Changes and/or additions in the command-line options: - The 'AWKPATH' environment variable for specifying a path @@ -26558,16 +27037,16 @@ current version of 'gawk'. - The '-b', '-c', '-C', '-d', '-D', '-e', '-E', '-g', '-h', '-i', '-l', '-L', '-M', '-n', '-N', '-o', '-O', '-p', '-P', - '-r', '-S', '-t', and '-V' short options. Also, the ability - to use GNU-style long-named options that start with '--', and - the '--assign', '--bignum', '--characters-as-bytes', + '-r', '-s', '-S', '-t', and '-V' short options. Also, the + ability to use GNU-style long-named options that start with + '--', and the '--assign', '--bignum', '--characters-as-bytes', '--copyright', '--debug', '--dump-variables', '--exec', '--field-separator', '--file', '--gen-pot', '--help', '--include', '--lint', '--lint-old', '--load', - '--non-decimal-data', '--optimize', '--posix', - '--pretty-print', '--profile', '--re-interval', '--sandbox', - '--source', '--traditional', '--use-lc-numeric', and - '--version' long options (*note Options::). + '--non-decimal-data', '--optimize', '--no-optimize', + '--posix', '--pretty-print', '--profile', '--re-interval', + '--sandbox', '--source', '--traditional', '--use-lc-numeric', + and '--version' long options (*note Options::). * Support for the following obsolete systems was removed from the code and the documentation for 'gawk' version 4.0: @@ -26601,6 +27080,11 @@ current version of 'gawk'. - Ultrix + * Support for the following systems was removed from the code for + 'gawk' version 4.2: + + - MirBSD + File: gawk.info, Node: Feature History, Next: Common Extensions, Prev: POSIX/GNU, Up: Language History @@ -26992,6 +27476,34 @@ POSIX 'awk', in the order they were added to 'gawk'. * Support for Ultrix was removed. + Version 4.2 introduced the following changes: + + * Changes to 'ENVIRON' are reflected into 'gawk''s environment and + that of programs that it runs. *Note Auto-set::. + + * The '--pretty-print' option no longer runs the 'awk' program too. + *Note Options::. + + * The 'igawk' program and its manual page are no longer installed + when 'gawk' is built. *Note Igawk Program::. + + * The 'intdiv()' function. *Note Numeric Functions::. + + * The maximum number of hexadecimal digits in '\x' escapes is now + two. *Note Escape Sequences::. + + * Nonfatal output with 'print' and 'printf'. *Note Nonfatal::. + + * For many years, POSIX specified that default field splitting only + allowed spaces and tabs to separate fields, and this was how 'gawk' + behaved with '--posix'. As of 2013, the standard restored + historical behavior, and now default field splitting with '--posix' + also allows newlines to separate fields. + + * Support for MirBSD was removed. + + * Support for GNU/Linux on Alpha was removed. + File: gawk.info, Node: Common Extensions, Next: Ranges and Locales, Prev: Feature History, Up: Language History @@ -27106,7 +27618,7 @@ ranges, such that outside the '"C"' and '"POSIX"' locales, the meaning of range expressions was _undefined_.(3) By using this lovely technical term, the standard gives license to -implementors to implement ranges in whatever way they choose. The +implementers to implement ranges in whatever way they choose. The 'gawk' maintainer chose to apply the pre-POSIX meaning both with the default regexp matching and when '--traditional' or '--posix' are used. In all cases 'gawk' remains POSIX-compliant. @@ -27510,7 +28022,9 @@ Various '.c', '.y', and '.h' files 'doc/igawk.1' The 'troff' source for a manual page describing the 'igawk' program - presented in *note Igawk Program::. + presented in *note Igawk Program::. (Since 'gawk' can do its own + '@include' processing, neither 'igawk' nor 'igawk.1' are + installed.) 'doc/Makefile.in' The input file used during the configuration process to generate @@ -27552,17 +28066,22 @@ Various '.c', '.y', and '.h' files contains a 'Makefile.in' file, which 'configure' uses to generate a 'Makefile'. 'Makefile.am' is used by GNU Automake to create 'Makefile.in'. The library functions from *note Library - Functions::, and the 'igawk' program from *note Igawk Program:: are - included as ready-to-use files in the 'gawk' distribution. They - are installed as part of the installation process. The rest of the - programs in this Info file are available in appropriate - subdirectories of 'awklib/eg'. + Functions::, are included as ready-to-use files in the 'gawk' + distribution. They are installed as part of the installation + process. The rest of the programs in this Info file are available + in appropriate subdirectories of 'awklib/eg'. 'extension/*' The source code, manual pages, and infrastructure files for the sample extensions included with 'gawk'. *Note Dynamic Extensions::, for more information. +'extras/*' + Additional non-essential files. Currently, this directory contains + some shell startup files to be installed in '/etc/profile.d' to aid + in manipulating the 'AWKPATH' and 'AWKLIBPATH' environment + variables. *Note Shell Startup Files::, for more information. + 'posix/*' Files needed for building 'gawk' on POSIX-compliant systems. @@ -27593,11 +28112,12 @@ for your system yourself. * Menu: * Quick Installation:: Compiling 'gawk' under Unix. +* Shell Startup Files:: Shell convenience functions. * Additional Configuration Options:: Other compile-time options. * Configuration Philosophy:: How it's all supposed to work. -File: gawk.info, Node: Quick Installation, Next: Additional Configuration Options, Up: Unix Installation +File: gawk.info, Node: Quick Installation, Next: Shell Startup Files, Up: Unix Installation B.2.1 Compiling 'gawk' for Unix-Like Systems -------------------------------------------- @@ -27652,9 +28172,42 @@ will be asked for your password, and you will have to have been set up previously as a user who is allowed to run the 'sudo' command. -File: gawk.info, Node: Additional Configuration Options, Next: Configuration Philosophy, Prev: Quick Installation, Up: Unix Installation +File: gawk.info, Node: Shell Startup Files, Next: Additional Configuration Options, Prev: Quick Installation, Up: Unix Installation + +B.2.2 Shell Startup Files +------------------------- + +The distribution contains shell startup files 'gawk.sh' and 'gawk.csh' +containing functions to aid in manipulating the 'AWKPATH' and +'AWKLIBPATH' environment variables. On a Fedora system, these files +should be installed in '/etc/profile.d'; on other platforms, the +appropriate location may be different. + +'gawkpath_default' + Reset the 'AWKPATH' environment variable to its default value. -B.2.2 Additional Configuration Options +'gawkpath_prepend' + Add the argument to the front of the 'AWKPATH' environment + variable. + +'gawkpath_append' + Add the argument to the end of the 'AWKPATH' environment variable. + +'gawklibpath_default' + Reset the 'AWKLIBPATH' environment variable to its default value. + +'gawklibpath_prepend' + Add the argument to the front of the 'AWKLIBPATH' environment + variable. + +'gawklibpath_append' + Add the argument to the end of the 'AWKLIBPATH' environment + variable. + + +File: gawk.info, Node: Additional Configuration Options, Next: Configuration Philosophy, Prev: Shell Startup Files, Up: Unix Installation + +B.2.3 Additional Configuration Options -------------------------------------- There are several additional options you may use on the 'configure' @@ -27698,7 +28251,7 @@ supplied by 'configure'. File: gawk.info, Node: Configuration Philosophy, Prev: Additional Configuration Options, Up: Unix Installation -B.2.3 The Configuration Process +B.2.4 The Configuration Process ------------------------------- This minor node is of interest only if you know something about using @@ -31585,20 +32138,21 @@ Index * --include option: Options. (line 159) * --lint option: Command Line. (line 20) * --lint option <1>: Options. (line 184) -* --lint-old option: Options. (line 294) +* --lint-old option: Options. (line 299) * --load option: Options. (line 172) +* --no-optimize option: Options. (line 285) * --non-decimal-data option: Options. (line 209) * --non-decimal-data option <1>: Nondecimal Data. (line 6) * --non-decimal-data option, strtonum() function and: Nondecimal Data. (line 35) -* --optimize option: Options. (line 236) -* --posix option: Options. (line 254) +* --optimize option: Options. (line 234) +* --posix option: Options. (line 257) * --posix option, --traditional option and: Options. (line 272) * --pretty-print option: Options. (line 223) -* --profile option: Options. (line 242) +* --profile option: Options. (line 245) * --profile option <1>: Profiling. (line 12) * --re-interval option: Options. (line 278) -* --sandbox option: Options. (line 285) +* --sandbox option: Options. (line 290) * --sandbox option, disabling system() function: I/O Functions. (line 129) * --sandbox option, input redirection with getline: Getline. (line 19) @@ -31608,7 +32162,7 @@ Index * --traditional option: Options. (line 82) * --traditional option, --posix option and: Options. (line 272) * --use-lc-numeric option: Options. (line 218) -* --version option: Options. (line 299) +* --version option: Options. (line 304) * --with-whiny-user-strftime configuration option: Additional Configuration Options. (line 37) * -b option: Options. (line 69) @@ -31618,31 +32172,32 @@ Index * -D option: Options. (line 108) * -e option: Options. (line 117) * -E option: Options. (line 125) -* -e option <1>: Options. (line 335) +* -e option <1>: Options. (line 340) * -f option: Long. (line 12) * -F option: Options. (line 21) * -f option <1>: Options. (line 25) -* -F option, -Ft sets FS to TAB: Options. (line 307) +* -F option, -Ft sets FS to TAB: Options. (line 312) * -F option, command-line: Command Line Field Separator. (line 6) -* -f option, multiple uses: Options. (line 312) +* -f option, multiple uses: Options. (line 317) * -g option: Options. (line 147) * -h option: Options. (line 154) * -i option: Options. (line 159) * -l option: Options. (line 172) * -l option <1>: Options. (line 184) -* -L option: Options. (line 294) +* -L option: Options. (line 299) * -M option: Options. (line 203) * -n option: Options. (line 209) * -N option: Options. (line 218) * -o option: Options. (line 223) -* -O option: Options. (line 236) -* -p option: Options. (line 242) -* -P option: Options. (line 254) +* -O option: Options. (line 234) +* -p option: Options. (line 245) +* -P option: Options. (line 257) * -r option: Options. (line 278) -* -S option: Options. (line 285) +* -s option: Options. (line 285) +* -S option: Options. (line 290) * -v option: Options. (line 32) -* -V option: Options. (line 299) +* -V option: Options. (line 304) * -v option <1>: Assignment Options. (line 12) * -W option: Options. (line 47) * . (period), regexp operator: Regexp Operators. (line 44) @@ -31715,16 +32270,16 @@ Index (line 6) * \ (backslash), in bracket expressions: Bracket Expressions. (line 25) * \ (backslash), in escape sequences: Escape Sequences. (line 6) -* \ (backslash), in escape sequences <1>: Escape Sequences. (line 100) +* \ (backslash), in escape sequences <1>: Escape Sequences. (line 103) * \ (backslash), in escape sequences, POSIX and: Escape Sequences. - (line 105) + (line 108) * \ (backslash), in regexp constants: Computed Regexps. (line 30) * \ (backslash), in shell commands: Quoting. (line 48) * \ (backslash), regexp operator: Regexp Operators. (line 18) -* \ (backslash), \" escape sequence: Escape Sequences. (line 82) +* \ (backslash), \" escape sequence: Escape Sequences. (line 85) * \ (backslash), \' operator (gawk): GNU Regexp Operators. (line 59) -* \ (backslash), \/ escape sequence: Escape Sequences. (line 73) +* \ (backslash), \/ escape sequence: Escape Sequences. (line 76) * \ (backslash), \< operator (gawk): GNU Regexp Operators. (line 33) * \ (backslash), \> operator (gawk): GNU Regexp Operators. @@ -31941,7 +32496,7 @@ Index * awf (amazingly workable formatter) program: Glossary. (line 24) * awk debugging, enabling: Options. (line 108) * awk language, POSIX version: Assignment Ops. (line 138) -* awk profiling, enabling: Options. (line 242) +* awk profiling, enabling: Options. (line 245) * awk programs: Getting Started. (line 12) * awk programs <1>: Executable Scripts. (line 6) * awk programs <2>: Two Rules. (line 6) @@ -32012,16 +32567,16 @@ Index (line 6) * backslash (\), in bracket expressions: Bracket Expressions. (line 25) * backslash (\), in escape sequences: Escape Sequences. (line 6) -* backslash (\), in escape sequences <1>: Escape Sequences. (line 100) +* backslash (\), in escape sequences <1>: Escape Sequences. (line 103) * backslash (\), in escape sequences, POSIX and: Escape Sequences. - (line 105) + (line 108) * backslash (\), in regexp constants: Computed Regexps. (line 30) * backslash (\), in shell commands: Quoting. (line 48) * backslash (\), regexp operator: Regexp Operators. (line 18) -* backslash (\), \" escape sequence: Escape Sequences. (line 82) +* backslash (\), \" escape sequence: Escape Sequences. (line 85) * backslash (\), \' operator (gawk): GNU Regexp Operators. (line 59) -* backslash (\), \/ escape sequence: Escape Sequences. (line 73) +* backslash (\), \/ escape sequence: Escape Sequences. (line 76) * backslash (\), \< operator (gawk): GNU Regexp Operators. (line 33) * backslash (\), \> operator (gawk): GNU Regexp Operators. @@ -32140,7 +32695,7 @@ Index * Brennan, Michael <5>: Other Versions. (line 6) * Brennan, Michael <6>: Other Versions. (line 48) * Brian Kernighan's awk: When. (line 21) -* Brian Kernighan's awk <1>: Escape Sequences. (line 109) +* Brian Kernighan's awk <1>: Escape Sequences. (line 112) * Brian Kernighan's awk <2>: GNU Regexp Operators. (line 85) * Brian Kernighan's awk <3>: Regexp Field Splitting. @@ -32347,7 +32902,7 @@ Index * cosine: Numeric Functions. (line 16) * counting: Wc Program. (line 6) * csh utility: Statements/Lines. (line 43) -* csh utility, POSIXLY_CORRECT environment variable: Options. (line 353) +* csh utility, POSIXLY_CORRECT environment variable: Options. (line 358) * csh utility, |& operator, comparison with: Two-way I/O. (line 27) * ctime() user-defined function: Function Example. (line 74) * currency symbols, localization: Explaining gettext. (line 104) @@ -32377,12 +32932,12 @@ Index * dark corner, CONVFMT variable: Strings And Numbers. (line 39) * dark corner, escape sequences: Other Arguments. (line 38) * dark corner, escape sequences, for metacharacters: Escape Sequences. - (line 141) + (line 144) * dark corner, exit statement: Exit Statement. (line 30) * dark corner, field separators: Full Line Fields. (line 22) * dark corner, FILENAME variable: Getline Notes. (line 19) -* dark corner, FILENAME variable <1>: Auto-set. (line 89) -* dark corner, FNR/NR variables: Auto-set. (line 326) +* dark corner, FILENAME variable <1>: Auto-set. (line 108) +* dark corner, FNR/NR variables: Auto-set. (line 357) * dark corner, format-control characters: Control Letters. (line 18) * dark corner, format-control characters <1>: Control Letters. (line 93) @@ -32577,12 +33132,12 @@ Index (line 132) * differences in awk and gawk, command-line directories: Command-line directories. (line 6) -* differences in awk and gawk, ERRNO variable: Auto-set. (line 73) +* differences in awk and gawk, ERRNO variable: Auto-set. (line 87) * differences in awk and gawk, error messages: Special FD. (line 19) * differences in awk and gawk, FIELDWIDTHS variable: User-modified. (line 37) * differences in awk and gawk, FPAT variable: User-modified. (line 43) -* differences in awk and gawk, FUNCTAB variable: Auto-set. (line 115) +* differences in awk and gawk, FUNCTAB variable: Auto-set. (line 134) * differences in awk and gawk, function arguments (gawk): Calling Built-in. (line 16) * differences in awk and gawk, getline command: Getline. (line 19) @@ -32605,7 +33160,7 @@ Index (line 262) * differences in awk and gawk, print/printf statements: Format Modifiers. (line 13) -* differences in awk and gawk, PROCINFO array: Auto-set. (line 129) +* differences in awk and gawk, PROCINFO array: Auto-set. (line 148) * differences in awk and gawk, read timeouts: Read Timeout. (line 6) * differences in awk and gawk, record separators: awk split records. (line 124) @@ -32613,9 +33168,11 @@ Index (line 43) * differences in awk and gawk, regular expressions: Case-sensitivity. (line 26) +* differences in awk and gawk, retrying input: Retrying Input. + (line 6) * differences in awk and gawk, RS/RT variables: gawk split records. (line 58) -* differences in awk and gawk, RT variable: Auto-set. (line 264) +* differences in awk and gawk, RT variable: Auto-set. (line 295) * differences in awk and gawk, single-character fields: Single Character Fields. (line 6) * differences in awk and gawk, split() function: String Functions. @@ -32623,7 +33180,7 @@ Index * differences in awk and gawk, strings: Scalar Constants. (line 20) * differences in awk and gawk, strings, storing: gawk split records. (line 76) -* differences in awk and gawk, SYMTAB variable: Auto-set. (line 268) +* differences in awk and gawk, SYMTAB variable: Auto-set. (line 299) * differences in awk and gawk, TEXTDOMAIN variable: User-modified. (line 152) * differences in awk and gawk, trunc-mod operation: Arithmetic Ops. @@ -32659,12 +33216,12 @@ Index * dump debugger command: Miscellaneous Debugger Commands. (line 9) * dupword.awk program: Dupword Program. (line 31) -* dynamic profiling: Profiling. (line 178) +* dynamic profiling: Profiling. (line 177) * dynamically loaded extensions: Dynamic Extensions. (line 6) * e debugger command (alias for enable): Breakpoint Control. (line 73) * EBCDIC: Ordinal Functions. (line 45) -* effective group ID of gawk user: Auto-set. (line 134) -* effective user ID of gawk user: Auto-set. (line 138) +* effective group ID of gawk user: Auto-set. (line 153) +* effective user ID of gawk user: Auto-set. (line 161) * egrep utility: Bracket Expressions. (line 34) * egrep utility <1>: Egrep Program. (line 6) * egrep.awk program: Egrep Program. (line 53) @@ -32719,14 +33276,14 @@ Index (line 11) * equals sign (=), == operator <1>: Precedence. (line 64) * EREs (Extended Regular Expressions): Bracket Expressions. (line 34) -* ERRNO variable: Auto-set. (line 73) +* ERRNO variable: Auto-set. (line 87) * ERRNO variable <1>: TCP/IP Networking. (line 54) * ERRNO variable, with BEGINFILE pattern: BEGINFILE/ENDFILE. (line 26) * ERRNO variable, with close() function: Close Files And Pipes. (line 140) * ERRNO variable, with getline command: Getline. (line 19) * error handling: Special FD. (line 19) -* error handling, ERRNO variable and: Auto-set. (line 73) +* error handling, ERRNO variable and: Auto-set. (line 87) * error output: Special FD. (line 6) * escape processing, gsub()/gensub()/sub() functions: Gory Details. (line 6) @@ -32767,7 +33324,7 @@ Index (line 102) * exp: Numeric Functions. (line 19) * expand utility: Very Simple. (line 73) -* Expat XML parser library: gawkextlib. (line 35) +* Expat XML parser library: gawkextlib. (line 37) * exponent: Numeric Functions. (line 19) * expressions: Expressions. (line 6) * expressions, as patterns: Expression Patterns. (line 6) @@ -32786,7 +33343,7 @@ Index (line 6) * extension API version: Extension Versioning. (line 6) -* extension API, version number: Auto-set. (line 223) +* extension API, version number: Auto-set. (line 246) * extension example: Extension Example. (line 6) * extension registration: Registration Functions. (line 6) @@ -32842,7 +33399,6 @@ Index * field separators, choice of: Field Separators. (line 50) * field separators, FIELDWIDTHS variable and: User-modified. (line 37) * field separators, FPAT variable and: User-modified. (line 43) -* field separators, POSIX and: Fields. (line 6) * field separators, regular expressions as: Field Separators. (line 50) * field separators, regular expressions as <1>: Regexp Field Splitting. (line 6) @@ -32870,7 +33426,7 @@ Index * file names, in compatibility mode: Special Caveats. (line 9) * file names, standard streams in gawk: Special FD. (line 48) * FILENAME variable: Reading Files. (line 6) -* FILENAME variable <1>: Auto-set. (line 89) +* FILENAME variable <1>: Auto-set. (line 108) * FILENAME variable, getline, setting with: Getline Notes. (line 19) * filenames, assignments as: Ignoring Assigns. (line 6) * files, .gmo: Explaining gettext. (line 42) @@ -32938,8 +33494,8 @@ Index * fnmatch() extension function: Extension Sample Fnmatch. (line 12) * FNR variable: Records. (line 6) -* FNR variable <1>: Auto-set. (line 99) -* FNR variable, changing: Auto-set. (line 326) +* FNR variable <1>: Auto-set. (line 118) +* FNR variable, changing: Auto-set. (line 357) * for statement: For Statement. (line 6) * for statement, looping over arrays: Scanning an Array. (line 20) * fork() extension function: Extension Sample Fork. @@ -32991,7 +33547,7 @@ Index * FSF (Free Software Foundation) <3>: Glossary. (line 405) * fts() extension function: Extension Sample File Functions. (line 60) -* FUNCTAB array: Auto-set. (line 115) +* FUNCTAB array: Auto-set. (line 134) * function calls: Function Calls. (line 6) * function calls, indirect: Indirect Calls. (line 6) * function calls, indirect, @-notation for: Indirect Calls. (line 47) @@ -33042,8 +33598,8 @@ Index * G., Daniel Richard: Acknowledgments. (line 60) * G., Daniel Richard <1>: Maintainers. (line 14) * Garfinkle, Scott: Contributors. (line 35) -* gawk program, dynamic profiling: Profiling. (line 178) -* gawk version: Auto-set. (line 198) +* gawk program, dynamic profiling: Profiling. (line 177) +* gawk version: Auto-set. (line 221) * gawk, ARGIND variable in: Other Arguments. (line 15) * gawk, awk and: Preface. (line 21) * gawk, awk and <1>: This Manual. (line 14) @@ -33064,10 +33620,10 @@ Index * gawk, ERRNO variable in <1>: Close Files And Pipes. (line 140) * gawk, ERRNO variable in <2>: BEGINFILE/ENDFILE. (line 26) -* gawk, ERRNO variable in <3>: Auto-set. (line 73) +* gawk, ERRNO variable in <3>: Auto-set. (line 87) * gawk, ERRNO variable in <4>: TCP/IP Networking. (line 54) -* gawk, escape sequences: Escape Sequences. (line 118) -* gawk, extensions, disabling: Options. (line 254) +* gawk, escape sequences: Escape Sequences. (line 121) +* gawk, extensions, disabling: Options. (line 257) * gawk, features, adding: Adding Code. (line 6) * gawk, features, advanced: Advanced Features. (line 6) * gawk, field separators and: User-modified. (line 71) @@ -33079,7 +33635,7 @@ Index * gawk, FPAT variable in: Splitting By Content. (line 25) * gawk, FPAT variable in <1>: User-modified. (line 43) -* gawk, FUNCTAB array in: Auto-set. (line 115) +* gawk, FUNCTAB array in: Auto-set. (line 134) * gawk, function arguments and: Calling Built-in. (line 16) * gawk, hexadecimal numbers and: Nondecimal-numbers. (line 41) * gawk, IGNORECASE variable in: Case-sensitivity. (line 26) @@ -33107,9 +33663,9 @@ Index * gawk, newlines in: Statements/Lines. (line 12) * gawk, octal numbers and: Nondecimal-numbers. (line 41) * gawk, predefined variables and: Built-in Variables. (line 14) -* gawk, PROCINFO array in: Auto-set. (line 129) +* gawk, PROCINFO array in: Auto-set. (line 148) * gawk, PROCINFO array in <1>: Time Functions. (line 47) -* gawk, PROCINFO array in <2>: Two-way I/O. (line 108) +* gawk, PROCINFO array in <2>: Two-way I/O. (line 114) * gawk, regexp constants and: Using Constant Regexps. (line 28) * gawk, regular expressions, case sensitivity: Case-sensitivity. @@ -33119,21 +33675,27 @@ Index * gawk, regular expressions, precedence: Regexp Operators. (line 161) * gawk, RT variable in: awk split records. (line 124) * gawk, RT variable in <1>: Multiple Line. (line 130) -* gawk, RT variable in <2>: Auto-set. (line 264) +* gawk, RT variable in <2>: Auto-set. (line 295) * gawk, See Also awk: Preface. (line 34) * gawk, source code, obtaining: Getting. (line 6) * gawk, splitting fields and: Constant Size. (line 86) * gawk, string-translation functions: I18N Functions. (line 6) -* gawk, SYMTAB array in: Auto-set. (line 268) +* gawk, SYMTAB array in: Auto-set. (line 299) * gawk, TEXTDOMAIN variable in: User-modified. (line 152) * gawk, timestamps: Time Functions. (line 6) * gawk, uses for: Preface. (line 34) -* gawk, versions of, information about, printing: Options. (line 299) +* gawk, versions of, information about, printing: Options. (line 304) * gawk, VMS version of: VMS Installation. (line 6) * gawk, word-boundary operator: GNU Regexp Operators. (line 66) * gawkextlib: gawkextlib. (line 6) * gawkextlib project: gawkextlib. (line 6) +* gawklibpath_append shell function: Shell Startup Files. (line 29) +* gawklibpath_default shell function: Shell Startup Files. (line 22) +* gawklibpath_prepend shell function: Shell Startup Files. (line 25) +* gawkpath_append shell function: Shell Startup Files. (line 19) +* gawkpath_default shell function: Shell Startup Files. (line 12) +* gawkpath_prepend shell function: Shell Startup Files. (line 15) * General Public License (GPL): Glossary. (line 396) * General Public License, See GPL: Manual History. (line 11) * generate time values: Time Functions. (line 25) @@ -33187,7 +33749,7 @@ Index * gettext() function (C library): Explaining gettext. (line 63) * gettimeofday() extension function: Extension Sample Time. (line 12) -* git utility: gawkextlib. (line 29) +* git utility: gawkextlib. (line 31) * git utility <1>: Other Versions. (line 29) * git utility <2>: Accessing The Source. (line 10) @@ -33215,7 +33777,7 @@ Index * Grigera, Juan: Contributors. (line 58) * group database, reading: Group Functions. (line 6) * group file: Group Functions. (line 6) -* group ID of gawk user: Auto-set. (line 147) +* group ID of gawk user: Auto-set. (line 170) * groups, information about: Group Functions. (line 6) * gsub: Using Constant Regexps. (line 43) @@ -33237,7 +33799,7 @@ Index * history expansion, in debugger: Readline Support. (line 6) * histsort.awk program: History Sorting. (line 25) * Hughes, Phil: Acknowledgments. (line 43) -* HUP signal, for dynamic profiling: Profiling. (line 210) +* HUP signal, for dynamic profiling: Profiling. (line 209) * hyphen (-), - operator: Precedence. (line 51) * hyphen (-), - operator <1>: Precedence. (line 57) * hyphen (-), -- operator: Increment Ops. (line 48) @@ -33319,7 +33881,9 @@ Index * installing gawk: Installation. (line 6) * instruction tracing, in debugger: Debugger Info. (line 90) * int: Numeric Functions. (line 24) -* INT signal (MS-Windows): Profiling. (line 213) +* INT signal (MS-Windows): Profiling. (line 212) +* intdiv: Numeric Functions. (line 29) +* intdiv <1>: Numeric Functions. (line 29) * integer array indices: Numeric Array Subscripts. (line 31) * integers, arbitrary precision: Arbitrary Precision Integers. @@ -33375,7 +33939,7 @@ Index * Kernighan, Brian <8>: Other Versions. (line 13) * Kernighan, Brian <9>: Basic Data Typing. (line 54) * Kernighan, Brian <10>: Glossary. (line 206) -* kill command, dynamic profiling: Profiling. (line 187) +* kill command, dynamic profiling: Profiling. (line 186) * Knights, jedi: Undocumented. (line 6) * Kwok, Conrad: Contributors. (line 35) * l debugger command (alias for list): Miscellaneous Debugger Commands. @@ -33448,7 +34012,7 @@ Index * lint checking, empty programs: Command Line. (line 16) * lint checking, issuing warnings: Options. (line 184) * lint checking, POSIXLY_CORRECT environment variable: Options. - (line 338) + (line 343) * lint checking, undefined functions: Pass By Value/Reference. (line 85) * LINT variable: User-modified. (line 87) @@ -33469,9 +34033,9 @@ Index * localization: I18N and L10N. (line 6) * localization, See internationalization, localization: I18N and L10N. (line 6) -* log: Numeric Functions. (line 29) +* log: Numeric Functions. (line 44) * log files, timestamps in: Time Functions. (line 6) -* logarithm: Numeric Functions. (line 29) +* logarithm: Numeric Functions. (line 44) * logical false/true: Truth Values. (line 6) * logical operators, See Boolean expressions: Boolean Ops. (line 6) * login information: Passwd Functions. (line 16) @@ -33508,12 +34072,12 @@ Index (line 9) * matching, leftmost longest: Multiple Line. (line 26) * matching, null strings: String Functions. (line 537) -* mawk utility: Escape Sequences. (line 118) +* mawk utility: Escape Sequences. (line 121) * mawk utility <1>: Getline/Pipe. (line 62) * mawk utility <2>: Concatenation. (line 36) * mawk utility <3>: Nextfile Statement. (line 47) * mawk utility <4>: Other Versions. (line 48) -* maximum precision supported by MPFR library: Auto-set. (line 212) +* maximum precision supported by MPFR library: Auto-set. (line 235) * McIlroy, Doug: Glossary. (line 257) * McPhee, Patrick: Contributors. (line 101) * message object files: Explaining gettext. (line 42) @@ -33525,8 +34089,8 @@ Index (line 48) * messages from extensions: Printing Messages. (line 6) * metacharacters in regular expressions: Regexp Operators. (line 6) -* metacharacters, escape sequences for: Escape Sequences. (line 137) -* minimum precision required by MPFR library: Auto-set. (line 215) +* metacharacters, escape sequences for: Escape Sequences. (line 140) +* minimum precision required by MPFR library: Auto-set. (line 238) * mktime: Time Functions. (line 25) * modifiers, in format specifiers: Format Modifiers. (line 6) * monetary information, localization: Explaining gettext. (line 104) @@ -33546,10 +34110,8 @@ Index * networks, programming: TCP/IP Networking. (line 6) * networks, support for: Special Network. (line 6) * newlines: Statements/Lines. (line 6) -* newlines <1>: Options. (line 260) +* newlines <1>: Options. (line 263) * newlines <2>: Boolean Ops. (line 69) -* newlines, as field separators: Default Field Splitting. - (line 6) * newlines, as record separators: awk split records. (line 12) * newlines, in dynamic regexps: Computed Regexps. (line 60) * newlines, in regexp constants: Computed Regexps. (line 70) @@ -33576,7 +34138,7 @@ Index * nexti debugger command: Debugger Execution Control. (line 49) * NF variable: Fields. (line 33) -* NF variable <1>: Auto-set. (line 104) +* NF variable <1>: Auto-set. (line 123) * NF variable, decrementing: Changing Fields. (line 107) * ni debugger command (alias for nexti): Debugger Execution Control. (line 49) @@ -33585,8 +34147,8 @@ Index (line 23) * not Boolean-logic operator: Boolean Ops. (line 6) * NR variable: Records. (line 6) -* NR variable <1>: Auto-set. (line 124) -* NR variable, changing: Auto-set. (line 326) +* NR variable <1>: Auto-set. (line 143) +* NR variable, changing: Auto-set. (line 357) * null strings: awk split records. (line 114) * null strings <1>: Regexp Field Splitting. (line 43) @@ -33706,7 +34268,7 @@ Index * p debugger command (alias for print): Viewing And Changing Data. (line 35) * Papadopoulos, Panos: Contributors. (line 129) -* parent process ID of gawk process: Auto-set. (line 187) +* parent process ID of gawk process: Auto-set. (line 210) * parentheses (), in a profile: Profiling. (line 146) * parentheses (), regexp operator: Regexp Operators. (line 81) * password file: Passwd Functions. (line 16) @@ -33750,14 +34312,14 @@ Index * plus sign (+), += operator <1>: Precedence. (line 94) * plus sign (+), regexp operator: Regexp Operators. (line 105) * pointers to functions: Indirect Calls. (line 6) -* portability: Escape Sequences. (line 100) +* portability: Escape Sequences. (line 103) * portability, #! (executable scripts): Executable Scripts. (line 33) * portability, ** operator and: Arithmetic Ops. (line 81) * portability, **= operator and: Assignment Ops. (line 144) * portability, ARGV variable: Executable Scripts. (line 59) * portability, backslash continuation and: Statements/Lines. (line 30) * portability, backslash in escape sequences: Escape Sequences. - (line 105) + (line 108) * portability, close() function and: Close Files And Pipes. (line 81) * portability, data files as single record: gawk split records. @@ -33775,7 +34337,7 @@ Index * portability, NF variable, decrementing: Changing Fields. (line 115) * portability, operators: Increment Ops. (line 60) * portability, operators, not in POSIX awk: Precedence. (line 97) -* portability, POSIXLY_CORRECT environment variable: Options. (line 358) +* portability, POSIXLY_CORRECT environment variable: Options. (line 363) * portability, substr() function: String Functions. (line 513) * portable object files: Explaining gettext. (line 37) * portable object files <1>: Translator i18n. (line 6) @@ -33796,7 +34358,7 @@ Index * POSIX awk, < operator and: Getline/File. (line 26) * POSIX awk, arithmetic operators and: Arithmetic Ops. (line 30) * POSIX awk, backslashes in string constants: Escape Sequences. - (line 105) + (line 108) * POSIX awk, BEGIN/END patterns: I/O And BEGIN/END. (line 15) * POSIX awk, bracket expressions and: Bracket Expressions. (line 34) * POSIX awk, bracket expressions and, character classes: Bracket Expressions. @@ -33808,9 +34370,7 @@ Index * POSIX awk, continue statement and: Continue Statement. (line 44) * POSIX awk, CONVFMT variable and: User-modified. (line 30) * POSIX awk, date utility and: Time Functions. (line 253) -* POSIX awk, field separators and: Fields. (line 6) -* POSIX awk, field separators and <1>: Full Line Fields. (line 16) -* POSIX awk, FS variable and: User-modified. (line 60) +* POSIX awk, field separators and: Full Line Fields. (line 16) * POSIX awk, function keyword in: Definition Syntax. (line 99) * POSIX awk, functions and, gsub()/sub(): Gory Details. (line 90) * POSIX awk, functions and, length(): String Functions. (line 179) @@ -33825,12 +34385,12 @@ Index * POSIX awk, regular expressions and: Regexp Operators. (line 161) * POSIX awk, timestamps and: Time Functions. (line 6) * POSIX awk, | I/O operator and: Getline/Pipe. (line 56) -* POSIX mode: Options. (line 254) -* POSIX mode <1>: Options. (line 338) +* POSIX mode: Options. (line 257) +* POSIX mode <1>: Options. (line 343) * POSIX, awk and: Preface. (line 21) * POSIX, gawk extensions not included in: POSIX/GNU. (line 6) * POSIX, programs, implementing in awk: Clones. (line 6) -* POSIXLY_CORRECT environment variable: Options. (line 338) +* POSIXLY_CORRECT environment variable: Options. (line 343) * PREC variable: User-modified. (line 124) * precedence: Increment Ops. (line 60) * precedence <1>: Precedence. (line 6) @@ -33877,14 +34437,14 @@ Index * printing, unduplicated lines of text: Uniq Program. (line 6) * printing, user information: Id Program. (line 6) * private variables: Library Names. (line 11) -* process group ID of gawk process: Auto-set. (line 181) -* process ID of gawk process: Auto-set. (line 184) +* process group ID of gawk process: Auto-set. (line 204) +* process ID of gawk process: Auto-set. (line 207) * processes, two-way communications with: Two-way I/O. (line 6) * processing data: Basic High Level. (line 6) -* PROCINFO array: Auto-set. (line 129) +* PROCINFO array: Auto-set. (line 148) * PROCINFO array <1>: Time Functions. (line 47) * PROCINFO array <2>: Passwd Functions. (line 6) -* PROCINFO array, and communications via ptys: Two-way I/O. (line 108) +* PROCINFO array, and communications via ptys: Two-way I/O. (line 114) * PROCINFO array, and group membership: Group Functions. (line 6) * PROCINFO array, and user and group ID numbers: Id Program. (line 15) * PROCINFO array, testing the field splitting: Passwd Functions. @@ -33892,8 +34452,8 @@ Index * PROCINFO, values of sorted_in: Controlling Scanning. (line 26) * profiling awk programs: Profiling. (line 6) -* profiling awk programs, dynamically: Profiling. (line 178) -* program identifiers: Auto-set. (line 150) +* profiling awk programs, dynamically: Profiling. (line 177) +* program identifiers: Auto-set. (line 173) * program, definition of: Getting Started. (line 21) * programming conventions, --non-decimal-data option: Nondecimal Data. (line 35) @@ -33929,7 +34489,7 @@ Index * QuikTrim Awk: Other Versions. (line 139) * quit debugger command: Miscellaneous Debugger Commands. (line 102) -* QUIT signal (MS-Windows): Profiling. (line 213) +* QUIT signal (MS-Windows): Profiling. (line 212) * quoting in gawk command lines: Long. (line 26) * quoting in gawk command lines, tricks for: Quoting. (line 91) * quoting, for small awk programs: Comments. (line 27) @@ -33938,12 +34498,12 @@ Index * Rakitzis, Byron: History Sorting. (line 25) * Ramey, Chet: Acknowledgments. (line 60) * Ramey, Chet <1>: General Data Types. (line 6) -* rand: Numeric Functions. (line 34) +* rand: Numeric Functions. (line 49) * random numbers, Cliff: Cliff Random Function. (line 6) * random numbers, rand()/srand() functions: Numeric Functions. - (line 34) -* random numbers, seed of: Numeric Functions. (line 64) + (line 49) +* random numbers, seed of: Numeric Functions. (line 79) * range expressions (regexps): Bracket Expressions. (line 6) * range patterns: Ranges. (line 6) * range patterns, line continuation and: Ranges. (line 64) @@ -34030,6 +34590,7 @@ Index * relational operators, See comparison operators: Typing and Comparison. (line 9) * replace in string: String Functions. (line 409) +* retrying input: Retrying Input. (line 6) * return debugger command: Debugger Execution Control. (line 54) * return statement, user-defined functions: Return Statement. (line 6) @@ -34053,7 +34614,7 @@ Index * right shift: Bitwise Functions. (line 54) * right shift, bitwise: Bitwise Functions. (line 32) * Ritchie, Dennis: Basic Data Typing. (line 54) -* RLENGTH variable: Auto-set. (line 251) +* RLENGTH variable: Auto-set. (line 282) * RLENGTH variable, match() function and: String Functions. (line 227) * Robbins, Arnold: Command Line Field Separator. (line 71) @@ -34079,11 +34640,11 @@ Index * RS variable <1>: User-modified. (line 133) * RS variable, multiline records and: Multiple Line. (line 17) * rshift: Bitwise Functions. (line 54) -* RSTART variable: Auto-set. (line 257) +* RSTART variable: Auto-set. (line 288) * RSTART variable, match() function and: String Functions. (line 227) * RT variable: awk split records. (line 124) * RT variable <1>: Multiple Line. (line 130) -* RT variable <2>: Auto-set. (line 264) +* RT variable <2>: Auto-set. (line 295) * Rubin, Paul: History. (line 30) * Rubin, Paul <1>: Contributors. (line 16) * rule, definition of: Getting Started. (line 21) @@ -34094,14 +34655,14 @@ Index (line 68) * sample debugging session: Sample Debugging Session. (line 6) -* sandbox mode: Options. (line 285) +* sandbox mode: Options. (line 290) * save debugger options: Debugger Info. (line 85) * scalar or array: Type Functions. (line 11) * scalar values: Basic Data Typing. (line 13) * scanning arrays: Scanning an Array. (line 6) * scanning multidimensional arrays: Multiscanning. (line 11) * Schorr, Andrew: Acknowledgments. (line 60) -* Schorr, Andrew <1>: Auto-set. (line 296) +* Schorr, Andrew <1>: Auto-set. (line 327) * Schorr, Andrew <2>: Contributors. (line 134) * Schreiber, Bert: Acknowledgments. (line 38) * Schreiber, Rita: Acknowledgments. (line 38) @@ -34120,7 +34681,7 @@ Index * sed utility: Full Line Fields. (line 22) * sed utility <1>: Simple Sed. (line 6) * sed utility <2>: Glossary. (line 16) -* seeding random number generator: Numeric Functions. (line 64) +* seeding random number generator: Numeric Functions. (line 79) * semicolon (;), AWKPATH variable and: PC Using. (line 9) * semicolon (;), separating statements in actions: Statements/Lines. (line 90) @@ -34132,7 +34693,6 @@ Index * separators, field <1>: User-modified. (line 113) * separators, field, FIELDWIDTHS variable and: User-modified. (line 37) * separators, field, FPAT variable and: User-modified. (line 43) -* separators, field, POSIX and: Fields. (line 6) * separators, for records: awk split records. (line 6) * separators, for records <1>: awk split records. (line 85) * separators, for records <2>: User-modified. (line 133) @@ -34184,14 +34744,14 @@ Index * sidebar, A Constant's Base Does Not Affect Its Value: Nondecimal-numbers. (line 63) * sidebar, Backslash Before Regular Characters: Escape Sequences. - (line 103) + (line 106) * sidebar, Changing FS Does Not Affect the Fields: Full Line Fields. (line 14) -* sidebar, Changing NR and FNR: Auto-set. (line 324) +* sidebar, Changing NR and FNR: Auto-set. (line 355) * sidebar, Controlling Output Buffering with system(): I/O Functions. (line 164) * sidebar, Escape Sequences for Metacharacters: Escape Sequences. - (line 135) + (line 138) * sidebar, FS and IGNORECASE: Field Splitting Summary. (line 37) * sidebar, Interactive Versus Noninteractive Buffering: I/O Functions. @@ -34213,19 +34773,19 @@ Index (line 130) * sidebar, Using \n in Bracket Expressions of Dynamic Regexps: Computed Regexps. (line 58) -* SIGHUP signal, for dynamic profiling: Profiling. (line 210) -* SIGINT signal (MS-Windows): Profiling. (line 213) -* signals, HUP/SIGHUP, for profiling: Profiling. (line 210) -* signals, INT/SIGINT (MS-Windows): Profiling. (line 213) -* signals, QUIT/SIGQUIT (MS-Windows): Profiling. (line 213) -* signals, USR1/SIGUSR1, for profiling: Profiling. (line 187) +* SIGHUP signal, for dynamic profiling: Profiling. (line 209) +* SIGINT signal (MS-Windows): Profiling. (line 212) +* signals, HUP/SIGHUP, for profiling: Profiling. (line 209) +* signals, INT/SIGINT (MS-Windows): Profiling. (line 212) +* signals, QUIT/SIGQUIT (MS-Windows): Profiling. (line 212) +* signals, USR1/SIGUSR1, for profiling: Profiling. (line 186) * signature program: Signature Program. (line 6) -* SIGQUIT signal (MS-Windows): Profiling. (line 213) -* SIGUSR1 signal, for dynamic profiling: Profiling. (line 187) +* SIGQUIT signal (MS-Windows): Profiling. (line 212) +* SIGUSR1 signal, for dynamic profiling: Profiling. (line 186) * silent debugger command: Debugger Execution Control. (line 10) -* sin: Numeric Functions. (line 75) -* sine: Numeric Functions. (line 75) +* sin: Numeric Functions. (line 90) +* sine: Numeric Functions. (line 90) * single quote ('): One-shot. (line 15) * single quote (') in gawk command lines: Long. (line 35) * single quote ('), in shell commands: Quoting. (line 48) @@ -34275,10 +34835,10 @@ Index * sprintf() function, OFMT variable and: User-modified. (line 113) * sprintf() function, print/printf statements and: Round Function. (line 6) -* sqrt: Numeric Functions. (line 78) +* sqrt: Numeric Functions. (line 93) * square brackets ([]), regexp operator: Regexp Operators. (line 56) -* square root: Numeric Functions. (line 78) -* srand: Numeric Functions. (line 82) +* square root: Numeric Functions. (line 93) +* srand: Numeric Functions. (line 97) * stack frame: Debugging Terms. (line 10) * Stallman, Richard: Manual History. (line 6) * Stallman, Richard <1>: Acknowledgments. (line 18) @@ -34350,9 +34910,9 @@ Index * substr: String Functions. (line 482) * substring: String Functions. (line 482) * Sumner, Andrew: Other Versions. (line 68) -* supplementary groups of gawk process: Auto-set. (line 228) +* supplementary groups of gawk process: Auto-set. (line 251) * switch statement: Switch Statement. (line 6) -* SYMTAB array: Auto-set. (line 268) +* SYMTAB array: Auto-set. (line 299) * syntactic ambiguity: /= operator vs. /=.../ regexp constant: Assignment Ops. (line 149) * system: I/O Functions. (line 107) @@ -34422,7 +34982,7 @@ Index (line 37) * troubleshooting, awk uses FS not IFS: Field Separators. (line 29) * troubleshooting, backslash before nonspecial character: Escape Sequences. - (line 105) + (line 108) * troubleshooting, division: Arithmetic Ops. (line 44) * troubleshooting, fatal errors, field widths, specifying: Constant Size. (line 22) @@ -34456,6 +35016,8 @@ Index * trunc-mod operation: Arithmetic Ops. (line 66) * truth values: Truth Values. (line 6) * type conversion: Strings And Numbers. (line 21) +* type, of variable: Type Functions. (line 14) +* typeof: Type Functions. (line 14) * u debugger command (alias for until): Debugger Execution Control. (line 82) * unassigned array elements: Reference to Elements. @@ -34478,7 +35040,7 @@ Index * uniq.awk program: Uniq Program. (line 65) * Unix: Glossary. (line 748) * Unix awk, backslashes in escape sequences: Escape Sequences. - (line 118) + (line 121) * Unix awk, close() function and: Close Files And Pipes. (line 132) * Unix awk, password files, field separators and: Command Line Field Separator. @@ -34497,10 +35059,11 @@ Index * user-modifiable variables: User-modified. (line 6) * users, information about, printing: Id Program. (line 6) * users, information about, retrieving: Passwd Functions. (line 16) -* USR1 signal, for dynamic profiling: Profiling. (line 187) +* USR1 signal, for dynamic profiling: Profiling. (line 186) * values, numeric: Basic Data Typing. (line 13) * values, string: Basic Data Typing. (line 13) * variable assignments and input files: Other Arguments. (line 26) +* variable type: Type Functions. (line 14) * variable typing: Typing and Comparison. (line 9) * variables: Other Features. (line 6) @@ -34531,10 +35094,10 @@ Index * variables, uninitialized, as array subscripts: Uninitialized Subscripts. (line 6) * variables, user-defined: Variables. (line 6) -* version of gawk: Auto-set. (line 198) -* version of gawk extension API: Auto-set. (line 223) -* version of GNU MP library: Auto-set. (line 206) -* version of GNU MPFR library: Auto-set. (line 208) +* version of gawk: Auto-set. (line 221) +* version of gawk extension API: Auto-set. (line 246) +* version of GNU MP library: Auto-set. (line 229) +* version of GNU MPFR library: Auto-set. (line 231) * vertical bar (|): Regexp Operators. (line 70) * vertical bar (|), | operator (I/O): Getline/Pipe. (line 10) * vertical bar (|), | operator (I/O) <1>: Precedence. (line 64) @@ -34571,7 +35134,7 @@ Index * whitespace, as field separators: Default Field Splitting. (line 6) * whitespace, functions, calling: Calling Built-in. (line 10) -* whitespace, newlines as: Options. (line 260) +* whitespace, newlines as: Options. (line 263) * Williams, Kent: Contributors. (line 35) * Woehlke, Matthew: Contributors. (line 80) * Woods, John: Contributors. (line 28) @@ -34601,563 +35164,570 @@ Index Tag Table: Node: Top1200 -Node: Foreword342162 -Node: Foreword446604 -Node: Preface48136 -Ref: Preface-Footnote-150995 -Ref: Preface-Footnote-251102 -Ref: Preface-Footnote-351336 -Node: History51478 -Node: Names53830 -Ref: Names-Footnote-154924 -Node: This Manual55071 -Ref: This Manual-Footnote-161556 -Node: Conventions61656 -Node: Manual History64010 -Ref: Manual History-Footnote-167005 -Ref: Manual History-Footnote-267046 -Node: How To Contribute67120 -Node: Acknowledgments68249 -Node: Getting Started73135 -Node: Running gawk75574 -Node: One-shot76764 -Node: Read Terminal78027 -Node: Long80020 -Node: Executable Scripts81533 -Ref: Executable Scripts-Footnote-184328 -Node: Comments84431 -Node: Quoting86915 -Node: DOS Quoting92432 -Node: Sample Data Files93107 -Node: Very Simple95702 -Node: Two Rules100604 -Node: More Complex102489 -Node: Statements/Lines105355 -Ref: Statements/Lines-Footnote-1109814 -Node: Other Features110079 -Node: When111015 -Ref: When-Footnote-1112769 -Node: Intro Summary112834 -Node: Invoking Gawk113718 -Node: Command Line115232 -Node: Options116030 -Ref: Options-Footnote-1131937 -Ref: Options-Footnote-2132167 -Node: Other Arguments132192 -Node: Naming Standard Input135139 -Node: Environment Variables136232 -Node: AWKPATH Variable136790 -Ref: AWKPATH Variable-Footnote-1140091 -Ref: AWKPATH Variable-Footnote-2140125 -Node: AWKLIBPATH Variable140386 -Node: Other Environment Variables141530 -Node: Exit Status145478 -Node: Include Files146155 -Node: Loading Shared Libraries149750 -Node: Obsolete151178 -Node: Undocumented151870 -Node: Invoking Summary152167 -Node: Regexp153827 -Node: Regexp Usage155281 -Node: Escape Sequences157318 -Node: Regexp Operators163332 -Ref: Regexp Operators-Footnote-1170748 -Ref: Regexp Operators-Footnote-2170895 -Node: Bracket Expressions170993 -Ref: table-char-classes173469 -Node: Leftmost Longest176606 -Node: Computed Regexps177909 -Node: GNU Regexp Operators181336 -Node: Case-sensitivity185015 -Ref: Case-sensitivity-Footnote-1187902 -Ref: Case-sensitivity-Footnote-2188137 -Node: Regexp Summary188245 -Node: Reading Files189711 -Node: Records191805 -Node: awk split records192538 -Node: gawk split records197469 -Ref: gawk split records-Footnote-1202009 -Node: Fields202046 -Ref: Fields-Footnote-1204826 -Node: Nonconstant Fields204912 -Ref: Nonconstant Fields-Footnote-1207148 -Node: Changing Fields207352 -Node: Field Separators213280 -Node: Default Field Splitting215978 -Node: Regexp Field Splitting217096 -Node: Single Character Fields220449 -Node: Command Line Field Separator221509 -Node: Full Line Fields224727 -Ref: Full Line Fields-Footnote-1226249 -Ref: Full Line Fields-Footnote-2226295 -Node: Field Splitting Summary226396 -Node: Constant Size228470 -Node: Splitting By Content233048 -Ref: Splitting By Content-Footnote-1237019 -Node: Multiple Line237182 -Ref: Multiple Line-Footnote-1243064 -Node: Getline243243 -Node: Plain Getline245447 -Node: Getline/Variable248086 -Node: Getline/File249235 -Node: Getline/Variable/File250621 -Ref: Getline/Variable/File-Footnote-1252224 -Node: Getline/Pipe252312 -Node: Getline/Variable/Pipe255017 -Node: Getline/Coprocess256150 -Node: Getline/Variable/Coprocess257415 -Node: Getline Notes258155 -Node: Getline Summary260950 -Ref: table-getline-variants261372 -Node: Read Timeout262120 -Ref: Read Timeout-Footnote-1265961 -Node: Command-line directories266019 -Node: Input Summary266923 -Node: Input Exercises270095 -Node: Printing270823 -Node: Print272599 -Node: Print Examples274056 -Node: Output Separators276836 -Node: OFMT278853 -Node: Printf280209 -Node: Basic Printf280994 -Node: Control Letters282568 -Node: Format Modifiers286556 -Node: Printf Examples292571 -Node: Redirection295057 -Node: Special FD301898 -Ref: Special FD-Footnote-1305066 -Node: Special Files305140 -Node: Other Inherited Files305757 -Node: Special Network306758 -Node: Special Caveats307618 -Node: Close Files And Pipes308567 -Ref: Close Files And Pipes-Footnote-1315760 -Ref: Close Files And Pipes-Footnote-2315908 -Node: Output Summary316059 -Node: Output Exercises317057 -Node: Expressions317736 -Node: Values318924 -Node: Constants319602 -Node: Scalar Constants320293 -Ref: Scalar Constants-Footnote-1321157 -Node: Nondecimal-numbers321407 -Node: Regexp Constants324420 -Node: Using Constant Regexps324946 -Node: Variables328109 -Node: Using Variables328766 -Node: Assignment Options330676 -Node: Conversion332549 -Node: Strings And Numbers333073 -Ref: Strings And Numbers-Footnote-1336136 -Node: Locale influences conversions336245 -Ref: table-locale-affects339003 -Node: All Operators339621 -Node: Arithmetic Ops340250 -Node: Concatenation342756 -Ref: Concatenation-Footnote-1345603 -Node: Assignment Ops345710 -Ref: table-assign-ops350701 -Node: Increment Ops352014 -Node: Truth Values and Conditions355474 -Node: Truth Values356548 -Node: Typing and Comparison357596 -Node: Variable Typing358416 -Node: Comparison Operators362040 -Ref: table-relational-ops362459 -Node: POSIX String Comparison365954 -Ref: POSIX String Comparison-Footnote-1367028 -Node: Boolean Ops367167 -Ref: Boolean Ops-Footnote-1371649 -Node: Conditional Exp371741 -Node: Function Calls373477 -Node: Precedence377354 -Node: Locales381013 -Node: Expressions Summary382645 -Node: Patterns and Actions385218 -Node: Pattern Overview386338 -Node: Regexp Patterns388015 -Node: Expression Patterns388557 -Node: Ranges392338 -Node: BEGIN/END395446 -Node: Using BEGIN/END396207 -Ref: Using BEGIN/END-Footnote-1398943 -Node: I/O And BEGIN/END399049 -Node: BEGINFILE/ENDFILE401363 -Node: Empty404270 -Node: Using Shell Variables404587 -Node: Action Overview406861 -Node: Statements409186 -Node: If Statement411034 -Node: While Statement412529 -Node: Do Statement414557 -Node: For Statement415705 -Node: Switch Statement418863 -Node: Break Statement421249 -Node: Continue Statement423341 -Node: Next Statement425168 -Node: Nextfile Statement427551 -Node: Exit Statement430203 -Node: Built-in Variables432606 -Node: User-modified433739 -Ref: User-modified-Footnote-1441364 -Node: Auto-set441426 -Ref: Auto-set-Footnote-1454782 -Ref: Auto-set-Footnote-2454988 -Node: ARGC and ARGV455044 -Node: Pattern Action Summary459257 -Node: Arrays461687 -Node: Array Basics463016 -Node: Array Intro463860 -Ref: figure-array-elements465835 -Ref: Array Intro-Footnote-1468539 -Node: Reference to Elements468667 -Node: Assigning Elements471131 -Node: Array Example471622 -Node: Scanning an Array473381 -Node: Controlling Scanning476403 -Ref: Controlling Scanning-Footnote-1481802 -Node: Numeric Array Subscripts482118 -Node: Uninitialized Subscripts484302 -Node: Delete485921 -Ref: Delete-Footnote-1488673 -Node: Multidimensional488730 -Node: Multiscanning491825 -Node: Arrays of Arrays493416 -Node: Arrays Summary498183 -Node: Functions500276 -Node: Built-in501314 -Node: Calling Built-in502395 -Node: Numeric Functions504391 -Ref: Numeric Functions-Footnote-1508419 -Ref: Numeric Functions-Footnote-2508776 -Ref: Numeric Functions-Footnote-3508824 -Node: String Functions509096 -Ref: String Functions-Footnote-1532600 -Ref: String Functions-Footnote-2532728 -Ref: String Functions-Footnote-3532976 -Node: Gory Details533063 -Ref: table-sub-escapes534854 -Ref: table-sub-proposed536373 -Ref: table-posix-sub537736 -Ref: table-gensub-escapes539277 -Ref: Gory Details-Footnote-1540100 -Node: I/O Functions540254 -Ref: table-system-return-values546836 -Ref: I/O Functions-Footnote-1548816 -Ref: I/O Functions-Footnote-2548964 -Node: Time Functions549084 -Ref: Time Functions-Footnote-1559606 -Ref: Time Functions-Footnote-2559674 -Ref: Time Functions-Footnote-3559832 -Ref: Time Functions-Footnote-4559943 -Ref: Time Functions-Footnote-5560055 -Ref: Time Functions-Footnote-6560282 -Node: Bitwise Functions560548 -Ref: table-bitwise-ops561142 -Ref: Bitwise Functions-Footnote-1565480 -Node: Type Functions565653 -Node: I18N Functions566809 -Node: User-defined568460 -Node: Definition Syntax569265 -Ref: Definition Syntax-Footnote-1574952 -Node: Function Example575023 -Ref: Function Example-Footnote-1577945 -Node: Function Caveats577967 -Node: Calling A Function578485 -Node: Variable Scope579443 -Node: Pass By Value/Reference582437 -Node: Return Statement585936 -Node: Dynamic Typing588915 -Node: Indirect Calls589845 -Ref: Indirect Calls-Footnote-1600096 -Node: Functions Summary600224 -Node: Library Functions602929 -Ref: Library Functions-Footnote-1606536 -Ref: Library Functions-Footnote-2606679 -Node: Library Names606850 -Ref: Library Names-Footnote-1610310 -Ref: Library Names-Footnote-2610533 -Node: General Functions610619 -Node: Strtonum Function611722 -Node: Assert Function614744 -Node: Round Function618070 -Node: Cliff Random Function619611 -Node: Ordinal Functions620627 -Ref: Ordinal Functions-Footnote-1623690 -Ref: Ordinal Functions-Footnote-2623942 -Node: Join Function624152 -Ref: Join Function-Footnote-1625922 -Node: Getlocaltime Function626122 -Node: Readfile Function629864 -Node: Shell Quoting631836 -Node: Data File Management633237 -Node: Filetrans Function633869 -Node: Rewind Function637965 -Node: File Checking639871 -Ref: File Checking-Footnote-1641205 -Node: Empty Files641406 -Node: Ignoring Assigns643385 -Node: Getopt Function644935 -Ref: Getopt Function-Footnote-1656404 -Node: Passwd Functions656604 -Ref: Passwd Functions-Footnote-1665443 -Node: Group Functions665531 -Ref: Group Functions-Footnote-1673429 -Node: Walking Arrays673636 -Node: Library Functions Summary676644 -Node: Library Exercises678050 -Node: Sample Programs678515 -Node: Running Examples679285 -Node: Clones680013 -Node: Cut Program681237 -Node: Egrep Program691166 -Ref: Egrep Program-Footnote-1698678 -Node: Id Program698788 -Node: Split Program702468 -Ref: Split Program-Footnote-1705927 -Node: Tee Program706056 -Node: Uniq Program708846 -Node: Wc Program716272 -Ref: Wc Program-Footnote-1720527 -Node: Miscellaneous Programs720621 -Node: Dupword Program721834 -Node: Alarm Program723864 -Node: Translate Program728719 -Ref: Translate Program-Footnote-1733284 -Node: Labels Program733554 -Ref: Labels Program-Footnote-1736905 -Node: Word Sorting736989 -Node: History Sorting741061 -Node: Extract Program742896 -Node: Simple Sed750425 -Node: Igawk Program753499 -Ref: Igawk Program-Footnote-1767830 -Ref: Igawk Program-Footnote-2768032 -Ref: Igawk Program-Footnote-3768154 -Node: Anagram Program768269 -Node: Signature Program771331 -Node: Programs Summary772578 -Node: Programs Exercises773792 -Ref: Programs Exercises-Footnote-1777921 -Node: Advanced Features778012 -Node: Nondecimal Data780002 -Node: Array Sorting781593 -Node: Controlling Array Traversal782293 -Ref: Controlling Array Traversal-Footnote-1790660 -Node: Array Sorting Functions790778 -Ref: Array Sorting Functions-Footnote-1795869 -Node: Two-way I/O796065 -Ref: Two-way I/O-Footnote-1802359 -Ref: Two-way I/O-Footnote-2802546 -Node: TCP/IP Networking802628 -Node: Profiling805746 -Node: Advanced Features Summary813285 -Node: Internationalization815221 -Node: I18N and L10N816701 -Node: Explaining gettext817388 -Ref: Explaining gettext-Footnote-1823280 -Ref: Explaining gettext-Footnote-2823465 -Node: Programmer i18n823630 -Ref: Programmer i18n-Footnote-1828485 -Node: Translator i18n828534 -Node: String Extraction829328 -Ref: String Extraction-Footnote-1830460 -Node: Printf Ordering830546 -Ref: Printf Ordering-Footnote-1833332 -Node: I18N Portability833396 -Ref: I18N Portability-Footnote-1835852 -Node: I18N Example835915 -Ref: I18N Example-Footnote-1838721 -Node: Gawk I18N838794 -Node: I18N Summary839439 -Node: Debugger840780 -Node: Debugging841802 -Node: Debugging Concepts842243 -Node: Debugging Terms844052 -Node: Awk Debugging846627 -Node: Sample Debugging Session847533 -Node: Debugger Invocation848067 -Node: Finding The Bug849453 -Node: List of Debugger Commands855931 -Node: Breakpoint Control857264 -Node: Debugger Execution Control860958 -Node: Viewing And Changing Data864320 -Node: Execution Stack867694 -Node: Debugger Info869331 -Node: Miscellaneous Debugger Commands873402 -Node: Readline Support878490 -Node: Limitations879386 -Node: Debugging Summary881495 -Node: Arbitrary Precision Arithmetic882668 -Node: Computer Arithmetic884084 -Ref: table-numeric-ranges887675 -Ref: Computer Arithmetic-Footnote-1888397 -Node: Math Definitions888454 -Ref: table-ieee-formats891768 -Ref: Math Definitions-Footnote-1892371 -Node: MPFR features892476 -Node: FP Math Caution894193 -Ref: FP Math Caution-Footnote-1895265 -Node: Inexactness of computations895634 -Node: Inexact representation896594 -Node: Comparing FP Values897954 -Node: Errors accumulate899036 -Node: Getting Accuracy900469 -Node: Try To Round903179 -Node: Setting precision904078 -Ref: table-predefined-precision-strings904775 -Node: Setting the rounding mode906605 -Ref: table-gawk-rounding-modes906979 -Ref: Setting the rounding mode-Footnote-1910387 -Node: Arbitrary Precision Integers910566 -Ref: Arbitrary Precision Integers-Footnote-1913550 -Node: POSIX Floating Point Problems913699 -Ref: POSIX Floating Point Problems-Footnote-1917581 -Node: Floating point summary917619 -Node: Dynamic Extensions919809 -Node: Extension Intro921362 -Node: Plugin License922628 -Node: Extension Mechanism Outline923425 -Ref: figure-load-extension923864 -Ref: figure-register-new-function925429 -Ref: figure-call-new-function926521 -Node: Extension API Description928583 -Node: Extension API Functions Introduction930031 -Node: General Data Types934843 -Ref: General Data Types-Footnote-1940798 -Node: Memory Allocation Functions941097 -Ref: Memory Allocation Functions-Footnote-1943942 -Node: Constructor Functions944041 -Node: Registration Functions945786 -Node: Extension Functions946471 -Node: Exit Callback Functions948770 -Node: Extension Version String950020 -Node: Input Parsers950683 -Node: Output Wrappers960565 -Node: Two-way processors965077 -Node: Printing Messages967342 -Ref: Printing Messages-Footnote-1968416 -Node: Updating ERRNO968569 -Node: Requesting Values969308 -Ref: table-value-types-returned970045 -Node: Accessing Parameters970928 -Node: Symbol Table Access972163 -Node: Symbol table by name972675 -Node: Symbol table by cookie974696 -Ref: Symbol table by cookie-Footnote-1978848 -Node: Cached values978912 -Ref: Cached values-Footnote-1982419 -Node: Array Manipulation982510 -Ref: Array Manipulation-Footnote-1983609 -Node: Array Data Types983646 -Ref: Array Data Types-Footnote-1986304 -Node: Array Functions986396 -Node: Flattening Arrays990254 -Node: Creating Arrays997162 -Node: Extension API Variables1001931 -Node: Extension Versioning1002567 -Ref: gawk-api-version1003004 -Node: Extension API Informational Variables1004760 -Node: Extension API Boilerplate1005824 -Node: Finding Extensions1009638 -Node: Extension Example1010197 -Node: Internal File Description1010995 -Node: Internal File Ops1015075 -Ref: Internal File Ops-Footnote-11026837 -Node: Using Internal File Ops1026977 -Ref: Using Internal File Ops-Footnote-11029360 -Node: Extension Samples1029634 -Node: Extension Sample File Functions1031163 -Node: Extension Sample Fnmatch1038812 -Node: Extension Sample Fork1040299 -Node: Extension Sample Inplace1041517 -Node: Extension Sample Ord1044727 -Node: Extension Sample Readdir1045563 -Ref: table-readdir-file-types1046452 -Node: Extension Sample Revout1047257 -Node: Extension Sample Rev2way1047846 -Node: Extension Sample Read write array1048586 -Node: Extension Sample Readfile1050528 -Node: Extension Sample Time1051623 -Node: Extension Sample API Tests1052971 -Node: gawkextlib1053463 -Node: Extension summary1055887 -Node: Extension Exercises1059579 -Node: Language History1061077 -Node: V7/SVR3.11062733 -Node: SVR41064885 -Node: POSIX1066319 -Node: BTL1067698 -Node: POSIX/GNU1068427 -Node: Feature History1073948 -Node: Common Extensions1087277 -Node: Ranges and Locales1088560 -Ref: Ranges and Locales-Footnote-11093176 -Ref: Ranges and Locales-Footnote-21093203 -Ref: Ranges and Locales-Footnote-31093438 -Node: Contributors1093659 -Node: History summary1099219 -Node: Installation1100599 -Node: Gawk Distribution1101543 -Node: Getting1102027 -Node: Extracting1102988 -Node: Distribution contents1104626 -Node: Unix Installation1110368 -Node: Quick Installation1110984 -Node: Additional Configuration Options1113411 -Node: Configuration Philosophy1115215 -Node: Non-Unix Installation1117584 -Node: PC Installation1118044 -Node: PC Binary Installation1118882 -Node: PC Compiling1119317 -Node: PC Using1120434 -Node: Cygwin1123479 -Node: MSYS1124249 -Node: VMS Installation1124750 -Node: VMS Compilation1125541 -Ref: VMS Compilation-Footnote-11126770 -Node: VMS Dynamic Extensions1126828 -Node: VMS Installation Details1128513 -Node: VMS Running1130766 -Node: VMS GNV1135045 -Node: VMS Old Gawk1135780 -Node: Bugs1136251 -Node: Bug address1136914 -Node: Usenet1139311 -Node: Maintainers1140086 -Node: Other Versions1141462 -Node: Installation summary1148046 -Node: Notes1149081 -Node: Compatibility Mode1149946 -Node: Additions1150728 -Node: Accessing The Source1151653 -Node: Adding Code1153088 -Node: New Ports1159307 -Node: Derived Files1163795 -Ref: Derived Files-Footnote-11169280 -Ref: Derived Files-Footnote-21169315 -Ref: Derived Files-Footnote-31169913 -Node: Future Extensions1170027 -Node: Implementation Limitations1170685 -Node: Extension Design1171868 -Node: Old Extension Problems1173022 -Ref: Old Extension Problems-Footnote-11174540 -Node: Extension New Mechanism Goals1174597 -Ref: Extension New Mechanism Goals-Footnote-11177961 -Node: Extension Other Design Decisions1178150 -Node: Extension Future Growth1180263 -Node: Old Extension Mechanism1181099 -Node: Notes summary1182862 -Node: Basic Concepts1184044 -Node: Basic High Level1184725 -Ref: figure-general-flow1185007 -Ref: figure-process-flow1185692 -Ref: Basic High Level-Footnote-11188993 -Node: Basic Data Typing1189178 -Node: Glossary1192506 -Node: Copying1224453 -Node: GNU Free Documentation License1261992 -Node: Index1287110 +Node: Foreword342530 +Node: Foreword446972 +Node: Preface48504 +Ref: Preface-Footnote-151363 +Ref: Preface-Footnote-251470 +Ref: Preface-Footnote-351704 +Node: History51846 +Node: Names54198 +Ref: Names-Footnote-155292 +Node: This Manual55439 +Ref: This Manual-Footnote-161924 +Node: Conventions62024 +Node: Manual History64378 +Ref: Manual History-Footnote-167373 +Ref: Manual History-Footnote-267414 +Node: How To Contribute67488 +Node: Acknowledgments68617 +Node: Getting Started73503 +Node: Running gawk75942 +Node: One-shot77132 +Node: Read Terminal78395 +Node: Long80388 +Node: Executable Scripts81901 +Ref: Executable Scripts-Footnote-184696 +Node: Comments84799 +Node: Quoting87283 +Node: DOS Quoting92800 +Node: Sample Data Files93475 +Node: Very Simple96070 +Node: Two Rules100972 +Node: More Complex102857 +Node: Statements/Lines105723 +Ref: Statements/Lines-Footnote-1110182 +Node: Other Features110447 +Node: When111383 +Ref: When-Footnote-1113137 +Node: Intro Summary113202 +Node: Invoking Gawk114086 +Node: Command Line115600 +Node: Options116398 +Ref: Options-Footnote-1132497 +Ref: Options-Footnote-2132727 +Node: Other Arguments132752 +Node: Naming Standard Input135699 +Node: Environment Variables136792 +Node: AWKPATH Variable137350 +Ref: AWKPATH Variable-Footnote-1140761 +Ref: AWKPATH Variable-Footnote-2140795 +Node: AWKLIBPATH Variable141056 +Node: Other Environment Variables142313 +Node: Exit Status146134 +Node: Include Files146811 +Node: Loading Shared Libraries150406 +Node: Obsolete151834 +Node: Undocumented152526 +Node: Invoking Summary152823 +Node: Regexp154483 +Node: Regexp Usage156002 +Node: Escape Sequences158039 +Node: Regexp Operators164271 +Ref: Regexp Operators-Footnote-1171687 +Ref: Regexp Operators-Footnote-2171834 +Node: Bracket Expressions171932 +Ref: table-char-classes174408 +Node: Leftmost Longest177545 +Node: Computed Regexps178848 +Node: GNU Regexp Operators182275 +Node: Case-sensitivity185954 +Ref: Case-sensitivity-Footnote-1188850 +Ref: Case-sensitivity-Footnote-2189085 +Node: Strong Regexp Constants189193 +Node: Regexp Summary189982 +Node: Reading Files191457 +Node: Records193620 +Node: awk split records194353 +Node: gawk split records199284 +Ref: gawk split records-Footnote-1203824 +Node: Fields203861 +Node: Nonconstant Fields206602 +Ref: Nonconstant Fields-Footnote-1208838 +Node: Changing Fields209042 +Node: Field Separators214970 +Node: Default Field Splitting217668 +Node: Regexp Field Splitting218786 +Node: Single Character Fields222139 +Node: Command Line Field Separator223199 +Node: Full Line Fields226417 +Ref: Full Line Fields-Footnote-1227939 +Ref: Full Line Fields-Footnote-2227985 +Node: Field Splitting Summary228086 +Node: Constant Size230160 +Node: Splitting By Content234738 +Ref: Splitting By Content-Footnote-1238709 +Node: Multiple Line238872 +Ref: Multiple Line-Footnote-1244754 +Node: Getline244933 +Node: Plain Getline247400 +Node: Getline/Variable250039 +Node: Getline/File251188 +Node: Getline/Variable/File252574 +Ref: Getline/Variable/File-Footnote-1254177 +Node: Getline/Pipe254265 +Node: Getline/Variable/Pipe256970 +Node: Getline/Coprocess258103 +Node: Getline/Variable/Coprocess259368 +Node: Getline Notes260108 +Node: Getline Summary262903 +Ref: table-getline-variants263325 +Node: Read Timeout264073 +Ref: Read Timeout-Footnote-1267979 +Node: Retrying Input268037 +Node: Command-line directories269236 +Node: Input Summary270142 +Node: Input Exercises273314 +Node: Printing274042 +Node: Print275876 +Node: Print Examples277333 +Node: Output Separators280113 +Node: OFMT282130 +Node: Printf283486 +Node: Basic Printf284271 +Node: Control Letters285845 +Node: Format Modifiers289833 +Node: Printf Examples295848 +Node: Redirection298334 +Node: Special FD305175 +Ref: Special FD-Footnote-1308343 +Node: Special Files308417 +Node: Other Inherited Files309034 +Node: Special Network310035 +Node: Special Caveats310895 +Node: Close Files And Pipes311844 +Ref: table-close-pipe-return-values318751 +Ref: Close Files And Pipes-Footnote-1319534 +Ref: Close Files And Pipes-Footnote-2319682 +Node: Nonfatal319834 +Node: Output Summary322159 +Node: Output Exercises323381 +Node: Expressions324060 +Node: Values325248 +Node: Constants325926 +Node: Scalar Constants326617 +Ref: Scalar Constants-Footnote-1327481 +Node: Nondecimal-numbers327731 +Node: Regexp Constants330744 +Node: Using Constant Regexps331270 +Node: Variables334433 +Node: Using Variables335090 +Node: Assignment Options337000 +Node: Conversion338873 +Node: Strings And Numbers339397 +Ref: Strings And Numbers-Footnote-1342460 +Node: Locale influences conversions342569 +Ref: table-locale-affects345327 +Node: All Operators345945 +Node: Arithmetic Ops346574 +Node: Concatenation349080 +Ref: Concatenation-Footnote-1351927 +Node: Assignment Ops352034 +Ref: table-assign-ops357025 +Node: Increment Ops358338 +Node: Truth Values and Conditions361798 +Node: Truth Values362872 +Node: Typing and Comparison363920 +Node: Variable Typing364740 +Node: Comparison Operators368364 +Ref: table-relational-ops368783 +Node: POSIX String Comparison372278 +Ref: POSIX String Comparison-Footnote-1373973 +Ref: POSIX String Comparison-Footnote-2374112 +Node: Boolean Ops374196 +Ref: Boolean Ops-Footnote-1378678 +Node: Conditional Exp378770 +Node: Function Calls380506 +Node: Precedence384383 +Node: Locales388042 +Node: Expressions Summary389674 +Node: Patterns and Actions392247 +Node: Pattern Overview393367 +Node: Regexp Patterns395044 +Node: Expression Patterns395586 +Node: Ranges399367 +Node: BEGIN/END402475 +Node: Using BEGIN/END403236 +Ref: Using BEGIN/END-Footnote-1405972 +Node: I/O And BEGIN/END406078 +Node: BEGINFILE/ENDFILE408392 +Node: Empty411299 +Node: Using Shell Variables411616 +Node: Action Overview413890 +Node: Statements416215 +Node: If Statement418063 +Node: While Statement419558 +Node: Do Statement421586 +Node: For Statement422734 +Node: Switch Statement425892 +Node: Break Statement428278 +Node: Continue Statement430370 +Node: Next Statement432197 +Node: Nextfile Statement434580 +Node: Exit Statement437232 +Node: Built-in Variables439635 +Node: User-modified440768 +Node: Auto-set448354 +Ref: Auto-set-Footnote-1463007 +Ref: Auto-set-Footnote-2463213 +Node: ARGC and ARGV463269 +Node: Pattern Action Summary467482 +Node: Arrays469912 +Node: Array Basics471241 +Node: Array Intro472085 +Ref: figure-array-elements474060 +Ref: Array Intro-Footnote-1476764 +Node: Reference to Elements476892 +Node: Assigning Elements479356 +Node: Array Example479847 +Node: Scanning an Array481606 +Node: Controlling Scanning484628 +Ref: Controlling Scanning-Footnote-1490027 +Node: Numeric Array Subscripts490343 +Node: Uninitialized Subscripts492527 +Node: Delete494146 +Ref: Delete-Footnote-1496898 +Node: Multidimensional496955 +Node: Multiscanning500050 +Node: Arrays of Arrays501641 +Node: Arrays Summary506408 +Node: Functions508501 +Node: Built-in509539 +Node: Calling Built-in510620 +Node: Numeric Functions512616 +Ref: Numeric Functions-Footnote-1517449 +Ref: Numeric Functions-Footnote-2517806 +Ref: Numeric Functions-Footnote-3517854 +Node: String Functions518126 +Ref: String Functions-Footnote-1541630 +Ref: String Functions-Footnote-2541758 +Ref: String Functions-Footnote-3542006 +Node: Gory Details542093 +Ref: table-sub-escapes543884 +Ref: table-sub-proposed545403 +Ref: table-posix-sub546766 +Ref: table-gensub-escapes548307 +Ref: Gory Details-Footnote-1549130 +Node: I/O Functions549284 +Ref: table-system-return-values555866 +Ref: I/O Functions-Footnote-1557846 +Ref: I/O Functions-Footnote-2557994 +Node: Time Functions558114 +Ref: Time Functions-Footnote-1568636 +Ref: Time Functions-Footnote-2568704 +Ref: Time Functions-Footnote-3568862 +Ref: Time Functions-Footnote-4568973 +Ref: Time Functions-Footnote-5569085 +Ref: Time Functions-Footnote-6569312 +Node: Bitwise Functions569578 +Ref: table-bitwise-ops570172 +Ref: Bitwise Functions-Footnote-1574510 +Node: Type Functions574683 +Node: I18N Functions577215 +Node: User-defined578866 +Node: Definition Syntax579671 +Ref: Definition Syntax-Footnote-1585358 +Node: Function Example585429 +Ref: Function Example-Footnote-1588351 +Node: Function Caveats588373 +Node: Calling A Function588891 +Node: Variable Scope589849 +Node: Pass By Value/Reference592843 +Node: Return Statement596342 +Node: Dynamic Typing599321 +Node: Indirect Calls600251 +Ref: Indirect Calls-Footnote-1610502 +Node: Functions Summary610630 +Node: Library Functions613335 +Ref: Library Functions-Footnote-1616942 +Ref: Library Functions-Footnote-2617085 +Node: Library Names617256 +Ref: Library Names-Footnote-1620716 +Ref: Library Names-Footnote-2620939 +Node: General Functions621025 +Node: Strtonum Function622128 +Node: Assert Function625150 +Node: Round Function628476 +Node: Cliff Random Function630017 +Node: Ordinal Functions631033 +Ref: Ordinal 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Functions-Footnote-1806275 +Node: Two-way I/O806471 +Ref: Two-way I/O-Footnote-1813021 +Ref: Two-way I/O-Footnote-2813208 +Node: TCP/IP Networking813290 +Node: Profiling816408 +Ref: Profiling-Footnote-1824901 +Node: Advanced Features Summary825224 +Node: Internationalization827068 +Node: I18N and L10N828548 +Node: Explaining gettext829235 +Ref: Explaining gettext-Footnote-1835127 +Ref: Explaining gettext-Footnote-2835312 +Node: Programmer i18n835477 +Ref: Programmer i18n-Footnote-1840332 +Node: Translator i18n840381 +Node: String Extraction841175 +Ref: String Extraction-Footnote-1842307 +Node: Printf Ordering842393 +Ref: Printf Ordering-Footnote-1845179 +Node: I18N Portability845243 +Ref: I18N Portability-Footnote-1847699 +Node: I18N Example847762 +Ref: I18N Example-Footnote-1850568 +Node: Gawk I18N850641 +Node: I18N Summary851286 +Node: Debugger852627 +Node: Debugging853649 +Node: Debugging Concepts854090 +Node: Debugging Terms855899 +Node: Awk Debugging858474 +Node: Sample Debugging Session859380 +Node: Debugger Invocation859914 +Node: Finding The Bug861300 +Node: List of Debugger Commands867778 +Node: Breakpoint Control869111 +Node: Debugger Execution Control872805 +Node: Viewing And Changing Data876167 +Node: Execution Stack879541 +Node: Debugger Info881178 +Node: Miscellaneous Debugger Commands885249 +Node: Readline Support890337 +Node: Limitations891233 +Ref: Limitations-Footnote-1895464 +Node: Debugging Summary895515 +Node: Arbitrary Precision Arithmetic896794 +Node: Computer Arithmetic898210 +Ref: table-numeric-ranges901801 +Ref: Computer Arithmetic-Footnote-1902523 +Node: Math Definitions902580 +Ref: table-ieee-formats905894 +Ref: Math Definitions-Footnote-1906497 +Node: MPFR features906602 +Node: FP Math Caution908319 +Ref: FP Math Caution-Footnote-1909391 +Node: Inexactness of computations909760 +Node: Inexact representation910720 +Node: Comparing FP Values912080 +Node: Errors accumulate913162 +Node: Getting Accuracy914595 +Node: Try To Round917305 +Node: Setting precision918204 +Ref: table-predefined-precision-strings918901 +Node: Setting the rounding mode920731 +Ref: table-gawk-rounding-modes921105 +Ref: Setting the rounding mode-Footnote-1924513 +Node: Arbitrary Precision Integers924692 +Ref: Arbitrary Precision Integers-Footnote-1929609 +Node: POSIX Floating Point Problems929758 +Ref: POSIX Floating Point Problems-Footnote-1933640 +Node: Floating point summary933678 +Node: Dynamic Extensions935868 +Node: Extension Intro937421 +Node: Plugin License938687 +Node: Extension Mechanism Outline939484 +Ref: figure-load-extension939923 +Ref: figure-register-new-function941488 +Ref: figure-call-new-function942580 +Node: Extension API Description944642 +Node: Extension API Functions Introduction946174 +Node: General Data Types951033 +Ref: General Data Types-Footnote-1956988 +Node: Memory Allocation Functions957287 +Ref: Memory Allocation Functions-Footnote-1960132 +Node: Constructor Functions960231 +Node: Registration Functions961976 +Node: Extension Functions962661 +Node: Exit Callback Functions965284 +Node: Extension Version String966534 +Node: Input Parsers967197 +Node: Output Wrappers977079 +Node: Two-way processors981591 +Node: Printing Messages983856 +Ref: Printing Messages-Footnote-1985027 +Node: Updating ERRNO985180 +Node: Requesting Values985919 +Ref: table-value-types-returned986656 +Node: Accessing Parameters987539 +Node: Symbol Table Access988774 +Node: Symbol table by name989286 +Node: Symbol table by cookie991307 +Ref: Symbol table by cookie-Footnote-1995459 +Node: Cached values995523 +Ref: Cached values-Footnote-1999030 +Node: Array Manipulation999121 +Ref: Array Manipulation-Footnote-11000212 +Node: Array Data Types1000249 +Ref: Array Data Types-Footnote-11002907 +Node: Array Functions1002999 +Node: Flattening Arrays1006857 +Node: Creating Arrays1013765 +Node: Redirection API1018534 +Node: Extension API Variables1021365 +Node: Extension Versioning1021998 +Ref: gawk-api-version1022435 +Node: Extension API 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Compilation-Footnote-11149091 +Node: VMS Dynamic Extensions1149149 +Node: VMS Installation Details1150834 +Node: VMS Running1153087 +Node: VMS GNV1157366 +Node: VMS Old Gawk1158101 +Node: Bugs1158572 +Node: Bug address1159235 +Node: Usenet1161632 +Node: Maintainers1162407 +Node: Other Versions1163783 +Node: Installation summary1170367 +Node: Notes1171402 +Node: Compatibility Mode1172267 +Node: Additions1173049 +Node: Accessing The Source1173974 +Node: Adding Code1175409 +Node: New Ports1181628 +Node: Derived Files1186116 +Ref: Derived Files-Footnote-11191601 +Ref: Derived Files-Footnote-21191636 +Ref: Derived Files-Footnote-31192234 +Node: Future Extensions1192348 +Node: Implementation Limitations1193006 +Node: Extension Design1194189 +Node: Old Extension Problems1195343 +Ref: Old Extension Problems-Footnote-11196861 +Node: Extension New Mechanism Goals1196918 +Ref: Extension New Mechanism Goals-Footnote-11200282 +Node: Extension Other Design Decisions1200471 +Node: Extension Future Growth1202584 +Node: Old Extension Mechanism1203420 +Node: Notes summary1205183 +Node: Basic Concepts1206365 +Node: Basic High Level1207046 +Ref: figure-general-flow1207328 +Ref: figure-process-flow1208013 +Ref: Basic High Level-Footnote-11211314 +Node: Basic Data Typing1211499 +Node: Glossary1214827 +Node: Copying1246774 +Node: GNU Free Documentation License1284313 +Node: Index1309431 End Tag Table |