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 54ccdd6b..0f2a5ead 100644 --- a/doc/ChangeLog +++ b/doc/ChangeLog @@ -12,6 +12,11 @@ * 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 b5120148..1b4a66e9 100644 --- a/doc/gawk.info +++ b/doc/gawk.info @@ -9681,9 +9681,18 @@ 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 {No value for `PVERSION'} 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 @@ -30144,9 +30153,9 @@ 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) @@ -30315,12 +30324,12 @@ 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) @@ -30343,14 +30352,14 @@ 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. @@ -30359,7 +30368,7 @@ 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. @@ -30440,13 +30449,13 @@ 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) @@ -30558,7 +30567,7 @@ 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) @@ -30625,9 +30634,9 @@ 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. @@ -30674,7 +30683,7 @@ 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) @@ -30743,7 +30752,7 @@ 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) @@ -30760,7 +30769,7 @@ 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. @@ -30791,7 +30800,7 @@ 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. @@ -30799,7 +30808,7 @@ 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) @@ -30808,7 +30817,7 @@ 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) @@ -31211,16 +31220,16 @@ 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. @@ -31500,7 +31509,7 @@ 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) @@ -31654,7 +31663,7 @@ 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) @@ -31681,9 +31690,9 @@ 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) @@ -31766,7 +31775,7 @@ 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. @@ -31909,7 +31918,7 @@ 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) @@ -32350,336 +32359,336 @@ Node: Built-in Variables403072 Node: User-modified404167 Ref: User-modified-Footnote-1412527 Node: Auto-set412589 -Ref: Auto-set-Footnote-1425667 -Ref: Auto-set-Footnote-2425872 -Node: ARGC and ARGV425928 -Node: Arrays429779 -Node: Array Basics431284 -Node: Array Intro432110 -Node: Reference to Elements436428 -Node: Assigning Elements438698 -Node: Array Example439189 -Node: Scanning an Array440921 -Node: Controlling Scanning443235 -Ref: Controlling Scanning-Footnote-1448158 -Node: Delete448474 -Ref: Delete-Footnote-1451239 -Node: Numeric Array Subscripts451296 -Node: Uninitialized Subscripts453479 -Node: Multi-dimensional455107 -Node: Multi-scanning458201 -Node: Arrays of Arrays459792 -Node: Functions464433 -Node: Built-in465252 -Node: Calling Built-in466330 -Node: Numeric Functions468318 -Ref: Numeric Functions-Footnote-1472150 -Ref: Numeric Functions-Footnote-2472507 -Ref: Numeric Functions-Footnote-3472555 -Node: String Functions472824 -Ref: String Functions-Footnote-1496382 -Ref: String Functions-Footnote-2496511 -Ref: String Functions-Footnote-3496759 -Node: Gory Details496846 -Ref: table-sub-escapes498525 -Ref: table-sub-posix-92499879 -Ref: table-sub-proposed501230 -Ref: table-posix-sub502584 -Ref: table-gensub-escapes504129 -Ref: Gory Details-Footnote-1505305 -Ref: Gory Details-Footnote-2505356 -Node: I/O Functions505507 -Ref: I/O Functions-Footnote-1512492 -Node: Time Functions512639 -Ref: Time Functions-Footnote-1523572 -Ref: Time Functions-Footnote-2523640 -Ref: Time Functions-Footnote-3523798 -Ref: Time Functions-Footnote-4523909 -Ref: Time Functions-Footnote-5524021 -Ref: Time Functions-Footnote-6524248 -Node: Bitwise Functions524514 -Ref: table-bitwise-ops525072 -Ref: Bitwise Functions-Footnote-1529293 -Node: Type Functions529477 -Node: I18N Functions530628 -Node: User-defined532255 -Node: Definition Syntax533059 -Ref: Definition Syntax-Footnote-1537969 -Node: Function Example538038 -Node: Function Caveats540632 -Node: Calling A Function541053 -Node: Variable Scope542168 -Node: Pass By Value/Reference545131 -Node: Return Statement548639 -Node: Dynamic Typing551620 -Node: Indirect Calls552551 -Node: Library Functions562236 -Ref: Library Functions-Footnote-1565749 -Ref: Library Functions-Footnote-2565892 -Node: Library Names566063 -Ref: Library Names-Footnote-1569534 -Ref: Library Names-Footnote-2569754 -Node: General Functions569840 -Node: Strtonum Function570868 -Node: Assert Function573798 -Node: Round Function577124 -Node: Cliff Random Function578667 -Node: Ordinal Functions579683 -Ref: Ordinal Functions-Footnote-1582753 -Ref: Ordinal Functions-Footnote-2583005 -Node: Join Function583214 -Ref: Join Function-Footnote-1584985 -Node: Getlocaltime Function585185 -Node: Readfile Function588926 -Node: Data File Management590765 -Node: Filetrans Function591397 -Node: Rewind Function595466 -Node: File Checking596853 -Node: Empty Files597947 -Node: Ignoring Assigns600177 -Node: Getopt Function601730 -Ref: Getopt Function-Footnote-1613034 -Node: Passwd Functions613237 -Ref: Passwd Functions-Footnote-1622212 -Node: Group Functions622300 -Node: Walking Arrays630384 -Node: Sample Programs632521 -Node: Running Examples633195 -Node: Clones633923 -Node: Cut Program635147 -Node: Egrep Program644992 -Ref: Egrep Program-Footnote-1652765 -Node: Id Program652875 -Node: Split Program656491 -Ref: Split Program-Footnote-1660010 -Node: Tee Program660138 -Node: Uniq Program662941 -Node: Wc Program670370 -Ref: Wc Program-Footnote-1674636 -Ref: Wc Program-Footnote-2674836 -Node: Miscellaneous Programs674928 -Node: Dupword Program676116 -Node: Alarm Program678147 -Node: Translate Program682896 -Ref: Translate Program-Footnote-1687283 -Ref: Translate Program-Footnote-2687511 -Node: Labels Program687645 -Ref: Labels Program-Footnote-1691016 -Node: Word Sorting691100 -Node: History Sorting694984 -Node: Extract Program696823 -Ref: Extract Program-Footnote-1704324 -Node: Simple Sed704452 -Node: Igawk Program707514 -Ref: Igawk Program-Footnote-1722671 -Ref: Igawk Program-Footnote-2722872 -Node: Anagram Program723010 -Node: Signature Program726078 -Node: Advanced Features727178 -Node: Nondecimal Data729060 -Node: Array Sorting730643 -Node: Controlling Array Traversal731340 -Node: Array Sorting Functions739578 -Ref: Array Sorting Functions-Footnote-1743252 -Ref: Array Sorting Functions-Footnote-2743345 -Node: Two-way I/O743539 -Ref: Two-way I/O-Footnote-1748971 -Node: TCP/IP Networking749041 -Node: Profiling751885 -Node: Internationalization759382 -Node: I18N and L10N760807 -Node: Explaining gettext761493 -Ref: Explaining gettext-Footnote-1766561 -Ref: Explaining gettext-Footnote-2766745 -Node: Programmer i18n766910 -Node: Translator i18n771112 -Node: String Extraction771905 -Ref: String Extraction-Footnote-1772866 -Node: Printf Ordering772952 -Ref: Printf Ordering-Footnote-1775736 -Node: I18N Portability775800 -Ref: I18N Portability-Footnote-1778249 -Node: I18N Example778312 -Ref: 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-Ref: load-extension871617 -Ref: load-new-function873095 -Ref: call-new-function874090 -Node: Extension API Description876105 -Node: Extension API Functions Introduction877318 -Node: General Data Types882184 -Ref: General Data Types-Footnote-1887786 -Node: Requesting Values888085 -Ref: table-value-types-returned888816 -Node: Constructor Functions889770 -Node: Registration Functions892790 -Node: Extension Functions893475 -Node: Exit Callback Functions895700 -Node: Extension Version String896949 -Node: Input Parsers897599 -Node: Output Wrappers907356 -Node: Two-way processors911866 -Node: Printing Messages914074 -Ref: Printing Messages-Footnote-1915151 -Node: Updating `ERRNO'915303 -Node: Accessing Parameters916042 -Node: Symbol Table Access917272 -Node: Symbol table by name917784 -Node: Symbol table by cookie919531 -Ref: Symbol table by cookie-Footnote-1923661 -Node: Cached values923724 -Ref: Cached values-Footnote-1927173 -Node: Array Manipulation927264 -Ref: Array 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Numeric Functions-Footnote-2472917 +Ref: Numeric Functions-Footnote-3472965 +Node: String Functions473234 +Ref: String Functions-Footnote-1496792 +Ref: String Functions-Footnote-2496921 +Ref: String Functions-Footnote-3497169 +Node: Gory Details497256 +Ref: table-sub-escapes498935 +Ref: table-sub-posix-92500289 +Ref: table-sub-proposed501640 +Ref: table-posix-sub502994 +Ref: table-gensub-escapes504539 +Ref: Gory Details-Footnote-1505715 +Ref: Gory Details-Footnote-2505766 +Node: I/O Functions505917 +Ref: I/O Functions-Footnote-1512902 +Node: Time Functions513049 +Ref: Time Functions-Footnote-1523982 +Ref: Time Functions-Footnote-2524050 +Ref: Time Functions-Footnote-3524208 +Ref: Time Functions-Footnote-4524319 +Ref: Time Functions-Footnote-5524431 +Ref: Time Functions-Footnote-6524658 +Node: Bitwise Functions524924 +Ref: table-bitwise-ops525482 +Ref: Bitwise Functions-Footnote-1529703 +Node: Type Functions529887 +Node: I18N Functions531038 +Node: User-defined532665 +Node: Definition Syntax533469 +Ref: Definition Syntax-Footnote-1538379 +Node: Function Example538448 +Node: Function Caveats541042 +Node: Calling A Function541463 +Node: Variable Scope542578 +Node: Pass By Value/Reference545541 +Node: Return Statement549049 +Node: Dynamic Typing552030 +Node: Indirect Calls552961 +Node: Library Functions562646 +Ref: Library Functions-Footnote-1566159 +Ref: Library Functions-Footnote-2566302 +Node: Library Names566473 +Ref: Library Names-Footnote-1569944 +Ref: Library Names-Footnote-2570164 +Node: General Functions570250 +Node: Strtonum Function571278 +Node: Assert Function574208 +Node: Round Function577534 +Node: Cliff Random Function579077 +Node: Ordinal Functions580093 +Ref: Ordinal Functions-Footnote-1583163 +Ref: Ordinal Functions-Footnote-2583415 +Node: Join Function583624 +Ref: Join Function-Footnote-1585395 +Node: Getlocaltime Function585595 +Node: Readfile Function589336 +Node: Data File Management591175 +Node: Filetrans Function591807 +Node: Rewind 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Compiling1043664 +Node: PC Testing1046608 +Node: PC Using1047784 +Node: Cygwin1051969 +Node: MSYS1052969 +Node: VMS Installation1053483 +Node: VMS Compilation1054086 +Ref: VMS Compilation-Footnote-11055093 +Node: VMS Installation Details1055151 +Node: VMS Running1056786 +Node: VMS Old Gawk1058393 +Node: Bugs1058867 +Node: Other Versions1062719 +Node: Notes1068800 +Node: Compatibility Mode1069600 +Node: Additions1070383 +Node: Accessing The Source1071310 +Node: Adding Code1072750 +Node: New Ports1078795 +Node: Derived Files1082930 +Ref: Derived Files-Footnote-11088251 +Ref: Derived Files-Footnote-21088285 +Ref: Derived Files-Footnote-31088885 +Node: Future Extensions1088983 +Node: Implementation Limitations1089564 +Node: Extension Design1090816 +Node: Old Extension Problems1091970 +Ref: Old Extension Problems-Footnote-11093478 +Node: Extension New Mechanism Goals1093535 +Ref: Extension New Mechanism Goals-Footnote-11096901 +Node: Extension Other Design Decisions1097087 +Node: Extension Future Growth1099193 +Node: Old Extension Mechanism1100029 +Node: Basic Concepts1101769 +Node: Basic High Level1102450 +Ref: figure-general-flow1102721 +Ref: figure-process-flow1103320 +Ref: Basic High Level-Footnote-11106549 +Node: Basic Data Typing1106734 +Node: Glossary1110089 +Node: Copying1135551 +Node: GNU Free Documentation License1173108 +Node: Index1198245 End Tag Table diff --git a/doc/gawk.texi b/doc/gawk.texi index b2c675fc..35e2169a 100644 --- a/doc/gawk.texi +++ b/doc/gawk.texi @@ -13647,10 +13647,18 @@ 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 @value{PVERSION} 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 8e1f3a97..6fd9681a 100644 --- a/doc/gawktexi.in +++ b/doc/gawktexi.in @@ -13032,10 +13032,18 @@ 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 @value{PVERSION} 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 |