diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/ChangeLog | 5 | ||||
| -rw-r--r-- | doc/gawk.1 | 10 | ||||
| -rw-r--r-- | doc/gawk.info | 731 | ||||
| -rw-r--r-- | doc/gawk.texi | 16 | ||||
| -rw-r--r-- | doc/gawktexi.in | 16 |
5 files changed, 407 insertions, 371 deletions
diff --git a/doc/ChangeLog b/doc/ChangeLog index 5cef4595..123ae722 100644 --- a/doc/ChangeLog +++ b/doc/ChangeLog @@ -22,6 +22,11 @@ * gawktexi.in (FN, FFN, DF,DDF, PVERSION, CTL): Remove macros. They have no alternate versions and are just in the way. +2013-08-15 Arnold D. Robbins <arnold@skeeve.com> + + * gawk.1: Document that ENVIRON updates affect the environment. + * gawktexi.in: Ditto. + 2013-06-27 Arnold D. Robbins <arnold@skeeve.com> * texinfo.tex: Update from Karl, fixes a formating problem. @@ -13,7 +13,7 @@ . if \w'\(rq' .ds rq "\(rq . \} .\} -.TH GAWK 1 "May 09 2013" "Free Software Foundation" "Utility Commands" +.TH GAWK 1 "Aug 15 2013" "Free Software Foundation" "Utility Commands" .SH NAME gawk \- pattern scanning and processing language .SH SYNOPSIS @@ -917,11 +917,17 @@ An array containing the values of the current environment. The array is indexed by the environment variables, each element being the value of that variable (e.g., \fBENVIRON["HOME"]\fP might be \fB"/home/arnold"\fR). -Changing this array does not affect the environment seen by programs which +.sp +In POSIX mode, +changing this array does not affect the environment seen by programs which .I gawk spawns via redirection or the .B system() function. +Otherwise, +.I gawk +updates its real environment so that programs it spawns see +the changes. .TP .B ERRNO If a system error occurs either doing a redirection for diff --git a/doc/gawk.info b/doc/gawk.info index 8fc3b2e9..a3b1b1b8 100644 --- a/doc/gawk.info +++ b/doc/gawk.info @@ -9692,9 +9692,18 @@ with a pound sign (`#'). 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. + example, `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. Some operating systems may not have environment variables. On such systems, the `ENVIRON' array is empty (except for @@ -30155,9 +30164,9 @@ Index * dark corner, exit statement: Exit Statement. (line 30) * dark corner, field separators: Field Splitting Summary. (line 46) -* dark corner, FILENAME variable <1>: Auto-set. (line 93) +* dark corner, FILENAME variable <1>: Auto-set. (line 102) * dark corner, FILENAME variable: Getline Notes. (line 19) -* dark corner, FNR/NR variables: Auto-set. (line 314) +* dark corner, FNR/NR variables: Auto-set. (line 323) * dark corner, format-control characters: Control Letters. (line 18) * dark corner, FS as null string: Single Character Fields. (line 20) @@ -30326,12 +30335,12 @@ Index (line 23) * differences in awk and gawk, close() function: Close Files And Pipes. (line 81) -* differences in awk and gawk, ERRNO variable: Auto-set. (line 73) +* differences in awk and gawk, ERRNO variable: Auto-set. (line 82) * differences in awk and gawk, error messages: Special FD. (line 16) * differences in awk and gawk, FIELDWIDTHS variable: User-modified. (line 35) * differences in awk and gawk, FPAT variable: User-modified. (line 45) -* differences in awk and gawk, FUNCTAB variable: Auto-set. (line 119) +* differences in awk and gawk, FUNCTAB variable: Auto-set. (line 128) * differences in awk and gawk, function arguments (gawk): Calling Built-in. (line 16) * differences in awk and gawk, getline command: Getline. (line 19) @@ -30354,14 +30363,14 @@ Index (line 261) * differences in awk and gawk, print/printf statements: Format Modifiers. (line 13) -* differences in awk and gawk, PROCINFO array: Auto-set. (line 133) +* differences in awk and gawk, PROCINFO array: Auto-set. (line 142) * differences in awk and gawk, record separators: Records. (line 117) * differences in awk and gawk, regexp constants: Using Constant Regexps. (line 43) * differences in awk and gawk, regular expressions: Case-sensitivity. (line 26) * differences in awk and gawk, RS/RT variables: Records. (line 172) -* differences in awk and gawk, RT variable: Auto-set. (line 266) +* differences in awk and gawk, RT variable: Auto-set. (line 275) * differences in awk and gawk, single-character fields: Single Character Fields. (line 6) * differences in awk and gawk, split() function: String Functions. @@ -30370,7 +30379,7 @@ Index * differences in awk and gawk, strings, storing: Records. (line 191) * differences in awk and gawk, strtonum() function (gawk): String Functions. (line 406) -* differences in awk and gawk, SYMTAB variable: Auto-set. (line 274) +* differences in awk and gawk, SYMTAB variable: Auto-set. (line 283) * differences in awk and gawk, TEXTDOMAIN variable: User-modified. (line 162) * differences in awk and gawk, trunc-mod operation: Arithmetic Ops. @@ -30451,13 +30460,13 @@ Index (line 11) * EREs (Extended Regular Expressions): Bracket Expressions. (line 24) * ERRNO variable <1>: TCP/IP Networking. (line 54) -* ERRNO variable <2>: Auto-set. (line 73) +* ERRNO variable <2>: Auto-set. (line 82) * ERRNO variable <3>: BEGINFILE/ENDFILE. (line 26) * ERRNO variable <4>: Close Files And Pipes. (line 138) * ERRNO variable: Getline. (line 19) * error handling: Special FD. (line 16) -* error handling, ERRNO variable and: Auto-set. (line 73) +* error handling, ERRNO variable and: Auto-set. (line 82) * error output: Special FD. (line 6) * escape processing, gsub()/gensub()/sub() functions: Gory Details. (line 6) @@ -30569,7 +30578,7 @@ Index * file names, distinguishing: Auto-set. (line 52) * file names, in compatibility mode: Special Caveats. (line 9) * file names, standard streams in gawk: Special FD. (line 46) -* FILENAME variable <1>: Auto-set. (line 93) +* FILENAME variable <1>: Auto-set. (line 102) * FILENAME variable: Reading Files. (line 6) * FILENAME variable, getline, setting with: Getline Notes. (line 19) * filenames, assignments as: Ignoring Assigns. (line 6) @@ -30636,9 +30645,9 @@ Index * floating-point, numbers: General Arithmetic. (line 6) * fnmatch extension function: Extension Sample Fnmatch. (line 6) -* FNR variable <1>: Auto-set. (line 103) +* FNR variable <1>: Auto-set. (line 112) * FNR variable: Records. (line 6) -* FNR variable, changing: Auto-set. (line 314) +* FNR variable, changing: Auto-set. (line 323) * for statement: For Statement. (line 6) * for statement, looping over arrays: Scanning an Array. (line 20) * fork extension function: Extension Sample Fork. @@ -30685,7 +30694,7 @@ Index * FSF (Free Software Foundation): Manual History. (line 6) * fts extension function: Extension Sample File Functions. (line 77) -* FUNCTAB array: Auto-set. (line 119) +* FUNCTAB array: Auto-set. (line 128) * function calls: Function Calls. (line 6) * function calls, indirect: Indirect Calls. (line 6) * function pointers: Indirect Calls. (line 6) @@ -30754,7 +30763,7 @@ Index * gawk, distribution: Distribution contents. (line 6) * gawk, ERRNO variable in <1>: TCP/IP Networking. (line 54) -* gawk, ERRNO variable in <2>: Auto-set. (line 73) +* gawk, ERRNO variable in <2>: Auto-set. (line 82) * gawk, ERRNO variable in <3>: BEGINFILE/ENDFILE. (line 26) * gawk, ERRNO variable in <4>: Close Files And Pipes. (line 138) @@ -30771,7 +30780,7 @@ Index * gawk, FPAT variable in <1>: User-modified. (line 45) * gawk, FPAT variable in: Splitting By Content. (line 26) -* gawk, FUNCTAB array in: Auto-set. (line 119) +* gawk, FUNCTAB array in: Auto-set. (line 128) * gawk, function arguments and: Calling Built-in. (line 16) * gawk, hexadecimal numbers and: Nondecimal-numbers. (line 42) * gawk, IGNORECASE variable in <1>: Array Sorting Functions. @@ -30802,7 +30811,7 @@ Index * gawk, OS/2 version of: PC Using. (line 11) * gawk, PROCINFO array in <1>: Two-way I/O. (line 116) * gawk, PROCINFO array in <2>: Time Functions. (line 47) -* gawk, PROCINFO array in: Auto-set. (line 133) +* gawk, PROCINFO array in: Auto-set. (line 142) * gawk, regexp constants and: Using Constant Regexps. (line 28) * gawk, regular expressions, case sensitivity: Case-sensitivity. @@ -30810,7 +30819,7 @@ Index * gawk, regular expressions, operators: GNU Regexp Operators. (line 6) * gawk, regular expressions, precedence: Regexp Operators. (line 161) -* gawk, RT variable in <1>: Auto-set. (line 266) +* gawk, RT variable in <1>: Auto-set. (line 275) * gawk, RT variable in <2>: Getline/Variable/File. (line 10) * gawk, RT variable in <3>: Multiple Line. (line 129) @@ -30819,7 +30828,7 @@ Index * gawk, source code, obtaining: Getting. (line 6) * gawk, splitting fields and: Constant Size. (line 87) * gawk, string-translation functions: I18N Functions. (line 6) -* gawk, SYMTAB array in: Auto-set. (line 274) +* gawk, SYMTAB array in: Auto-set. (line 283) * gawk, TEXTDOMAIN variable in: User-modified. (line 162) * gawk, timestamps: Time Functions. (line 6) * gawk, uses for: Preface. (line 36) @@ -31222,16 +31231,16 @@ Index (line 47) * nexti debugger command: Debugger Execution Control. (line 49) -* NF variable <1>: Auto-set. (line 108) +* NF variable <1>: Auto-set. (line 117) * NF variable: Fields. (line 33) * NF variable, decrementing: Changing Fields. (line 107) * ni debugger command (alias for nexti): Debugger Execution Control. (line 49) * noassign.awk program: Ignoring Assigns. (line 15) * not Boolean-logic operator: Boolean Ops. (line 6) -* NR variable <1>: Auto-set. (line 128) +* NR variable <1>: Auto-set. (line 137) * NR variable: Records. (line 6) -* NR variable, changing: Auto-set. (line 314) +* NR variable, changing: Auto-set. (line 323) * null strings <1>: Basic Data Typing. (line 26) * null strings <2>: Truth Values. (line 6) * null strings <3>: Regexp Field Splitting. @@ -31511,7 +31520,7 @@ Index * PROCINFO array <3>: Group Functions. (line 6) * PROCINFO array <4>: Passwd Functions. (line 6) * PROCINFO array <5>: Time Functions. (line 47) -* PROCINFO array <6>: Auto-set. (line 133) +* PROCINFO array <6>: Auto-set. (line 142) * PROCINFO array: Obsolete. (line 11) * profiling awk programs: Profiling. (line 6) * profiling awk programs, dynamically: Profiling. (line 172) @@ -31665,7 +31674,7 @@ Index * right angle bracket (>), >> operator (I/O): Redirection. (line 50) * right shift, bitwise: Bitwise Functions. (line 32) * Ritchie, Dennis: Basic Data Typing. (line 55) -* RLENGTH variable: Auto-set. (line 253) +* RLENGTH variable: Auto-set. (line 262) * RLENGTH variable, match() function and: String Functions. (line 225) * Robbins, Arnold <1>: Future Extensions. (line 6) * Robbins, Arnold <2>: Bugs. (line 32) @@ -31692,9 +31701,9 @@ Index * RS variable: Records. (line 20) * RS variable, multiline records and: Multiple Line. (line 17) * rshift() function (gawk): Bitwise Functions. (line 52) -* RSTART variable: Auto-set. (line 259) +* RSTART variable: Auto-set. (line 268) * RSTART variable, match() function and: String Functions. (line 225) -* RT variable <1>: Auto-set. (line 266) +* RT variable <1>: Auto-set. (line 275) * RT variable <2>: Getline/Variable/File. (line 10) * RT variable <3>: Multiple Line. (line 129) @@ -31777,7 +31786,7 @@ Index (line 110) * sidebar, Changing FS Does Not Affect the Fields: Field Splitting Summary. (line 38) -* sidebar, Changing NR and FNR: Auto-set. (line 312) +* sidebar, Changing NR and FNR: Auto-set. (line 321) * sidebar, Controlling Output Buffering with system(): I/O Functions. (line 135) * sidebar, Escape Sequences for Metacharacters: Escape Sequences. @@ -31920,7 +31929,7 @@ Index * substr() function: String Functions. (line 483) * Sumner, Andrew: Other Versions. (line 64) * switch statement: Switch Statement. (line 6) -* SYMTAB array: Auto-set. (line 274) +* SYMTAB array: Auto-set. (line 283) * syntactic ambiguity: /= operator vs. /=.../ regexp constant: Assignment Ops. (line 147) * system() function: I/O Functions. (line 72) @@ -32361,336 +32370,336 @@ Node: Built-in Variables403541 Node: User-modified404636 Ref: User-modified-Footnote-1412996 Node: Auto-set413058 -Ref: Auto-set-Footnote-1426136 -Ref: Auto-set-Footnote-2426341 -Node: ARGC and ARGV426397 -Node: Arrays430248 -Node: Array Basics431753 -Node: Array Intro432579 -Node: Reference to Elements436897 -Node: Assigning Elements439167 -Node: Array Example439658 -Node: Scanning an Array441390 -Node: Controlling Scanning443704 -Ref: Controlling Scanning-Footnote-1448627 -Node: Delete448943 -Ref: Delete-Footnote-1451708 -Node: Numeric Array Subscripts451765 -Node: Uninitialized Subscripts453948 -Node: Multi-dimensional455576 -Node: Multi-scanning458670 -Node: Arrays of Arrays460261 -Node: Functions464902 -Node: Built-in465721 -Node: Calling Built-in466799 -Node: Numeric Functions468787 -Ref: Numeric Functions-Footnote-1472619 -Ref: Numeric Functions-Footnote-2472976 -Ref: Numeric Functions-Footnote-3473024 -Node: String Functions473293 -Ref: String Functions-Footnote-1496851 -Ref: String Functions-Footnote-2496980 -Ref: String Functions-Footnote-3497228 -Node: Gory Details497315 -Ref: table-sub-escapes498994 -Ref: table-sub-posix-92500348 -Ref: table-sub-proposed501699 -Ref: table-posix-sub503053 -Ref: table-gensub-escapes504598 -Ref: Gory Details-Footnote-1505774 -Ref: Gory Details-Footnote-2505825 -Node: I/O Functions505976 -Ref: I/O Functions-Footnote-1512961 -Node: Time Functions513108 -Ref: Time Functions-Footnote-1524041 -Ref: Time Functions-Footnote-2524109 -Ref: Time Functions-Footnote-3524267 -Ref: Time Functions-Footnote-4524378 -Ref: Time Functions-Footnote-5524490 -Ref: Time Functions-Footnote-6524717 -Node: Bitwise Functions524983 -Ref: table-bitwise-ops525541 -Ref: Bitwise Functions-Footnote-1529762 -Node: Type Functions529946 -Node: I18N Functions531097 -Node: User-defined532724 -Node: Definition Syntax533528 -Ref: Definition Syntax-Footnote-1538438 -Node: Function Example538507 -Node: Function Caveats541101 -Node: Calling A Function541522 -Node: Variable Scope542637 -Node: Pass By Value/Reference545600 -Node: Return Statement549108 -Node: Dynamic Typing552089 -Node: Indirect Calls553020 -Node: Library Functions562705 -Ref: Library Functions-Footnote-1566218 -Ref: Library Functions-Footnote-2566361 -Node: Library Names566532 -Ref: Library Names-Footnote-1570003 -Ref: Library Names-Footnote-2570223 -Node: General Functions570309 -Node: Strtonum Function571337 -Node: Assert Function574267 -Node: Round Function577593 -Node: Cliff Random Function579136 -Node: Ordinal Functions580152 -Ref: Ordinal Functions-Footnote-1583222 -Ref: Ordinal Functions-Footnote-2583474 -Node: Join Function583683 -Ref: Join Function-Footnote-1585454 -Node: Getlocaltime Function585654 -Node: Readfile Function589395 -Node: Data File Management591234 -Node: Filetrans Function591866 -Node: Rewind Function595935 -Node: File Checking597322 -Node: Empty Files598416 -Node: Ignoring Assigns600646 -Node: Getopt Function602199 -Ref: Getopt Function-Footnote-1613503 -Node: Passwd Functions613706 -Ref: Passwd Functions-Footnote-1622681 -Node: Group Functions622769 -Node: Walking Arrays630853 -Node: Sample Programs632990 -Node: Running Examples633664 -Node: Clones634392 -Node: Cut Program635616 -Node: Egrep Program645461 -Ref: Egrep Program-Footnote-1653234 -Node: Id Program653344 -Node: Split Program656960 -Ref: Split Program-Footnote-1660479 -Node: Tee Program660607 -Node: Uniq Program663410 -Node: Wc Program670839 -Ref: Wc Program-Footnote-1675105 -Ref: Wc Program-Footnote-2675305 -Node: Miscellaneous Programs675397 -Node: Dupword Program676585 -Node: Alarm Program678616 -Node: Translate Program683365 -Ref: Translate Program-Footnote-1687752 -Ref: Translate Program-Footnote-2687980 -Node: Labels Program688114 -Ref: Labels Program-Footnote-1691485 -Node: Word Sorting691569 -Node: History Sorting695453 -Node: Extract Program697292 -Ref: Extract Program-Footnote-1704793 -Node: Simple Sed704921 -Node: Igawk Program707983 -Ref: Igawk Program-Footnote-1723140 -Ref: Igawk Program-Footnote-2723341 -Node: Anagram Program723479 -Node: Signature Program726547 -Node: Advanced Features727647 -Node: Nondecimal Data729529 -Node: Array Sorting731112 -Node: Controlling Array Traversal731809 -Node: Array Sorting Functions740047 -Ref: Array Sorting Functions-Footnote-1743721 -Ref: Array Sorting Functions-Footnote-2743814 -Node: Two-way I/O744008 -Ref: Two-way I/O-Footnote-1749440 -Node: TCP/IP Networking749510 -Node: Profiling752354 -Node: Internationalization759851 -Node: I18N and L10N761276 -Node: Explaining gettext761962 -Ref: Explaining gettext-Footnote-1767030 -Ref: Explaining gettext-Footnote-2767214 -Node: Programmer i18n767379 -Node: Translator i18n771581 -Node: String Extraction772374 -Ref: String Extraction-Footnote-1773335 -Node: Printf Ordering773421 -Ref: Printf Ordering-Footnote-1776205 -Node: I18N Portability776269 -Ref: I18N Portability-Footnote-1778718 -Node: I18N Example778781 -Ref: I18N Example-Footnote-1781419 -Node: Gawk I18N781491 -Node: Debugger782112 -Node: Debugging783083 -Node: Debugging Concepts783516 -Node: Debugging Terms785372 -Node: Awk Debugging787969 -Node: Sample Debugging Session788861 -Node: Debugger Invocation789381 -Node: Finding The Bug790713 -Node: List of Debugger Commands797201 -Node: Breakpoint Control798535 -Node: Debugger Execution Control802199 -Node: Viewing And Changing Data805559 -Node: Execution Stack808915 -Node: Debugger Info810382 -Node: Miscellaneous Debugger Commands814364 -Node: Readline Support819540 -Node: Limitations820371 -Node: Arbitrary Precision Arithmetic822623 -Ref: Arbitrary Precision Arithmetic-Footnote-1824274 -Node: General Arithmetic824422 -Node: Floating Point Issues826142 -Node: String Conversion Precision827023 -Ref: String Conversion Precision-Footnote-1828728 -Node: Unexpected Results828837 -Node: POSIX Floating Point Problems830990 -Ref: POSIX Floating Point Problems-Footnote-1834815 -Node: Integer Programming834853 -Node: Floating-point Programming836592 -Ref: Floating-point Programming-Footnote-1842923 -Ref: Floating-point Programming-Footnote-2843193 -Node: Floating-point Representation843457 -Node: Floating-point Context844622 -Ref: table-ieee-formats845461 -Node: Rounding Mode846845 -Ref: table-rounding-modes847324 -Ref: Rounding Mode-Footnote-1850339 -Node: Gawk and MPFR850518 -Node: Arbitrary Precision Floats851773 -Ref: Arbitrary Precision Floats-Footnote-1854216 -Node: Setting Precision854532 -Ref: table-predefined-precision-strings855218 -Node: Setting Rounding Mode857363 -Ref: table-gawk-rounding-modes857767 -Node: Floating-point Constants858954 -Node: Changing Precision860383 -Ref: Changing Precision-Footnote-1861783 -Node: Exact Arithmetic861957 -Node: Arbitrary Precision Integers865095 -Ref: Arbitrary Precision Integers-Footnote-1868113 -Node: Dynamic Extensions868260 -Node: Extension Intro869718 -Node: Plugin License870983 -Node: Extension Mechanism Outline871668 -Ref: load-extension872085 -Ref: load-new-function873563 -Ref: call-new-function874558 -Node: Extension API Description876573 -Node: Extension API Functions Introduction877786 -Node: General Data Types882652 -Ref: General Data Types-Footnote-1888254 -Node: Requesting Values888553 -Ref: table-value-types-returned889284 -Node: Constructor Functions890238 -Node: Registration Functions893258 -Node: Extension Functions893943 -Node: Exit Callback Functions896168 -Node: Extension Version String897417 -Node: Input Parsers898067 -Node: Output Wrappers907824 -Node: Two-way processors912334 -Node: Printing Messages914542 -Ref: Printing Messages-Footnote-1915619 -Node: Updating `ERRNO'915771 -Node: Accessing Parameters916510 -Node: Symbol Table Access917740 -Node: Symbol table by name918252 -Node: Symbol table by cookie919999 -Ref: Symbol table by cookie-Footnote-1924129 -Node: Cached values924192 -Ref: Cached values-Footnote-1927641 -Node: Array Manipulation927732 -Ref: Array 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Syntax533920 +Ref: Definition Syntax-Footnote-1538830 +Node: Function Example538899 +Node: Function Caveats541493 +Node: Calling A Function541914 +Node: Variable Scope543029 +Node: Pass By Value/Reference545992 +Node: Return Statement549500 +Node: Dynamic Typing552481 +Node: Indirect Calls553412 +Node: Library Functions563097 +Ref: Library Functions-Footnote-1566610 +Ref: Library Functions-Footnote-2566753 +Node: Library Names566924 +Ref: Library Names-Footnote-1570395 +Ref: Library Names-Footnote-2570615 +Node: General Functions570701 +Node: Strtonum Function571729 +Node: Assert Function574659 +Node: Round Function577985 +Node: Cliff Random Function579528 +Node: Ordinal Functions580544 +Ref: Ordinal Functions-Footnote-1583614 +Ref: Ordinal Functions-Footnote-2583866 +Node: Join Function584075 +Ref: Join Function-Footnote-1585846 +Node: Getlocaltime Function586046 +Node: Readfile Function589787 +Node: Data File Management591626 +Node: Filetrans Function592258 +Node: Rewind 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Compiling1044114 +Node: PC Testing1047058 +Node: PC Using1048234 +Node: Cygwin1052419 +Node: MSYS1053419 +Node: VMS Installation1053933 +Node: VMS Compilation1054536 +Ref: VMS Compilation-Footnote-11055543 +Node: VMS Installation Details1055601 +Node: VMS Running1057236 +Node: VMS Old Gawk1058843 +Node: Bugs1059317 +Node: Other Versions1063169 +Node: Notes1069250 +Node: Compatibility Mode1070050 +Node: Additions1070833 +Node: Accessing The Source1071760 +Node: Adding Code1073200 +Node: New Ports1079245 +Node: Derived Files1083380 +Ref: Derived Files-Footnote-11088701 +Ref: Derived Files-Footnote-21088735 +Ref: Derived Files-Footnote-31089335 +Node: Future Extensions1089433 +Node: Implementation Limitations1090014 +Node: Extension Design1091266 +Node: Old Extension Problems1092420 +Ref: Old Extension Problems-Footnote-11093928 +Node: Extension New Mechanism Goals1093985 +Ref: Extension New Mechanism Goals-Footnote-11097351 +Node: Extension Other Design Decisions1097537 +Node: Extension Future Growth1099643 +Node: Old Extension Mechanism1100479 +Node: Basic Concepts1102219 +Node: Basic High Level1102900 +Ref: figure-general-flow1103171 +Ref: figure-process-flow1103770 +Ref: Basic High Level-Footnote-11106999 +Node: Basic Data Typing1107184 +Node: Glossary1110539 +Node: Copying1136001 +Node: GNU Free Documentation License1173558 +Node: Index1198695 End Tag Table diff --git a/doc/gawk.texi b/doc/gawk.texi index cd7d88a9..e8d4cc41 100644 --- a/doc/gawk.texi +++ b/doc/gawk.texi @@ -13658,10 +13658,18 @@ it is 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, -@code{ENVIRON["HOME"]} might be @file{/home/arnold}. Changing this array -does not affect the environment passed on to any programs that -@command{awk} may spawn via redirection or the @code{system()} function. -@c (In a future version of @command{gawk}, it may do so.) +@code{ENVIRON["HOME"]} might be @file{/home/arnold}. + +For POSIX @command{awk}, changing this array does not affect the +environment passed on to any programs that @command{awk} may spawn via +redirection or the @code{system()} function. + +However, beginning with version 4.2, if not in POSIX +compatibility mode, @command{gawk} does update its own environment when +@code{ENVIRON} is changed, thus changing the environment seen by programs +that it creates. You should therefore be especially careful if you +modify @code{ENVIRON["PATH"]"}, which is the search path for finding +executable programs. Some operating systems may not have environment variables. On such systems, the @code{ENVIRON} array is empty (except for diff --git a/doc/gawktexi.in b/doc/gawktexi.in index f5e0fc06..9b3b2a84 100644 --- a/doc/gawktexi.in +++ b/doc/gawktexi.in @@ -13043,10 +13043,18 @@ it is 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, -@code{ENVIRON["HOME"]} might be @file{/home/arnold}. Changing this array -does not affect the environment passed on to any programs that -@command{awk} may spawn via redirection or the @code{system()} function. -@c (In a future version of @command{gawk}, it may do so.) +@code{ENVIRON["HOME"]} might be @file{/home/arnold}. + +For POSIX @command{awk}, changing this array does not affect the +environment passed on to any programs that @command{awk} may spawn via +redirection or the @code{system()} function. + +However, beginning with version 4.2, if not in POSIX +compatibility mode, @command{gawk} does update its own environment when +@code{ENVIRON} is changed, thus changing the environment seen by programs +that it creates. You should therefore be especially careful if you +modify @code{ENVIRON["PATH"]"}, which is the search path for finding +executable programs. Some operating systems may not have environment variables. On such systems, the @code{ENVIRON} array is empty (except for |