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Diffstat (limited to 'doc/gawk.info')
| -rw-r--r-- | doc/gawk.info | 514 |
1 files changed, 264 insertions, 250 deletions
diff --git a/doc/gawk.info b/doc/gawk.info index 46368574..bfac4508 100644 --- a/doc/gawk.info +++ b/doc/gawk.info @@ -9371,10 +9371,19 @@ with a pound sign (`#'). The value of the `getuid()' system call. `PROCINFO["sorted_in"]' - If this element exists in `PROCINFO', _no matter what its - value_, then `gawk' will cause `for(i in arr) ...' loops to - traverse the array indices in sorted order. *Note Scanning - an Array::, for more information. + If this element exists in `PROCINFO', its value controls the + order in which array indices will be processed by `for(i in + arr) ...' loops. A value of `"ascending index string"', + which may be shortened to `"ascending index"' or just + `"ascending"', will result in either case sensitive or case + insensitive ascending order depending upon the value of + `IGNORECASE'. A value of `"descending index string"', which + may be shortened in a similar manner, will result in the + opposite order. The value `"unsorted"' is also recognized, + yielding the default result of arbitrary order. Any other + value will be ignored, and warned about (at the time of first + `for(in in arr) ...' execution) when lint checking is enabled. + *Note Scanning an Array::, for more information. `PROCINFO["strftime"]' The default time format string for `strftime()'. Assigning a @@ -9888,14 +9897,16 @@ them. Similarly, changing VAR inside the loop may produce strange results. It is best to avoid such things. As an extension, `gawk' makes it possible for you to loop over the -elements of an array in order, sorted by index. Sorting is based on -string comparison (since all array indices are strings), and you cannot -control the style of sorting; it is always from lowest to highest -(`"A"' before `"B"'). To enable this feature, create the array element -`PROCINFO["sorted_in"]' (*note Auto-set::). The value of this element -does not matter; `gawk' only tests if the element with this index -exists in `PROCINFO' or not. This extension is disabled in POSIX mode, -since the `PROCINFO' array is not special in that case. For example: +elements of an array in order, based on the value of +`PROCINFO["sorted_in"]' (*note Auto-set::). At present two sorting +options are available: `"ascending index string"' and `"descending +index string"'. They can be shortened by omitting `string' or `index +string'. The value `"unsorted"' can be used as an explicit "no-op" and +yields the same result as when `PROCINFO["sorted_in"]' has no value at +all. If the index strings contain letters, the value of `IGNORECASE' +affects the order of the result. This extension is disabled in POSIX +mode, since the `PROCINFO' array is not special in that case. For +example: $ gawk 'BEGIN { > a[4] = 4 @@ -9906,7 +9917,7 @@ since the `PROCINFO' array is not special in that case. For example: -| 4 4 -| 3 3 $ gawk 'BEGIN { - > PROCINFO["sorted_in"]++ + > PROCINFO["sorted_in"] = "ascending index" > a[4] = 4 > a[3] = 3 > for (i in a) @@ -22678,6 +22689,9 @@ Metacharacters Instead, they denote regular expression operations, such as repetition, grouping, or alternation. +No-op + An operation that does nothing. + Null String A string with no characters in it. It is represented explicitly in `awk' programs by placing two double quote characters next to each @@ -24361,7 +24375,7 @@ Index (line 67) * advanced features, data files as single record: Records. (line 175) * advanced features, fixed-width data: Constant Size. (line 9) -* advanced features, FNR/NR variables: Auto-set. (line 206) +* advanced features, FNR/NR variables: Auto-set. (line 215) * advanced features, gawk: Advanced Features. (line 6) * advanced features, gawk, network programming: TCP/IP Networking. (line 6) @@ -24654,7 +24668,7 @@ Index * Brian Kernighan's awk, extensions: BTL. (line 6) * Broder, Alan J.: Contributors. (line 85) * Brown, Martin: Contributors. (line 79) -* BSD-based operating systems: Glossary. (line 591) +* BSD-based operating systems: Glossary. (line 594) * bt debugger command (alias for backtrace): Dgawk Stack. (line 13) * Buening, Andreas <1>: Bugs. (line 71) * Buening, Andreas <2>: Contributors. (line 89) @@ -24856,7 +24870,7 @@ Index (line 47) * dark corner, FILENAME variable <1>: Auto-set. (line 92) * dark corner, FILENAME variable: Getline Notes. (line 19) -* dark corner, FNR/NR variables: Auto-set. (line 206) +* dark corner, FNR/NR variables: Auto-set. (line 215) * dark corner, format-control characters: Control Letters. (line 18) * dark corner, FS as null string: Single Character Fields. (line 20) @@ -25055,7 +25069,7 @@ Index * differences in awk and gawk, regular expressions: Case-sensitivity. (line 26) * differences in awk and gawk, RS/RT variables: Records. (line 167) -* differences in awk and gawk, RT variable: Auto-set. (line 195) +* differences in awk and gawk, RT variable: Auto-set. (line 204) * differences in awk and gawk, single-character fields: Single Character Fields. (line 6) * differences in awk and gawk, split() function: String Functions. @@ -25336,7 +25350,7 @@ Index * floating-point, numbers, AWKNUM internal type: Internals. (line 19) * FNR variable <1>: Auto-set. (line 102) * FNR variable: Records. (line 6) -* FNR variable, changing: Auto-set. (line 206) +* FNR variable, changing: Auto-set. (line 215) * for statement: For Statement. (line 6) * for statement, in arrays: Scanning an Array. (line 20) * force_number() internal function: Internals. (line 27) @@ -25366,7 +25380,7 @@ Index * Free Software Foundation (FSF) <1>: Glossary. (line 297) * Free Software Foundation (FSF) <2>: Getting. (line 10) * Free Software Foundation (FSF): Manual History. (line 6) -* FreeBSD: Glossary. (line 591) +* FreeBSD: Glossary. (line 594) * FS variable <1>: User-modified. (line 56) * FS variable: Field Separators. (line 14) * FS variable, --field-separator option and: Options. (line 21) @@ -25510,7 +25524,7 @@ Index * gawk, regular expressions, operators: GNU Regexp Operators. (line 6) * gawk, regular expressions, precedence: Regexp Operators. (line 157) -* gawk, RT variable in <1>: Auto-set. (line 195) +* gawk, RT variable in <1>: Auto-set. (line 204) * gawk, RT variable in <2>: Getline/Variable/File. (line 10) * gawk, RT variable in <3>: Multiple Line. (line 129) @@ -25586,7 +25600,7 @@ Index * GNU long options, printing list of: Options. (line 141) * GNU Project <1>: Glossary. (line 315) * GNU Project: Manual History. (line 11) -* GNU/Linux <1>: Glossary. (line 591) +* GNU/Linux <1>: Glossary. (line 594) * GNU/Linux <2>: I18N Example. (line 55) * GNU/Linux: Manual History. (line 28) * GPL (General Public License) <1>: Glossary. (line 306) @@ -25841,7 +25855,7 @@ Index * lint checking, undefined functions: Pass By Value/Reference. (line 88) * LINT variable: User-modified. (line 98) -* Linux <1>: Glossary. (line 591) +* Linux <1>: Glossary. (line 594) * Linux <2>: I18N Example. (line 55) * Linux: Manual History. (line 28) * list debugger command: Miscellaneous Dgawk Commands. @@ -25912,7 +25926,7 @@ Index * nargs internal variable: Internals. (line 49) * nawk utility: Names. (line 17) * negative zero: Unexpected Results. (line 28) -* NetBSD: Glossary. (line 591) +* NetBSD: Glossary. (line 594) * networks, programming: TCP/IP Networking. (line 6) * networks, support for: Special Network. (line 6) * newlines <1>: Boolean Ops. (line 67) @@ -25957,7 +25971,7 @@ Index * not Boolean-logic operator: Boolean Ops. (line 6) * NR variable <1>: Auto-set. (line 118) * NR variable: Records. (line 6) -* NR variable, changing: Auto-set. (line 206) +* NR variable, changing: Auto-set. (line 215) * null strings <1>: Basic Data Typing. (line 50) * null strings <2>: Truth Values. (line 6) * null strings <3>: Regexp Field Splitting. @@ -26006,7 +26020,7 @@ Index * OFS variable <1>: User-modified. (line 124) * OFS variable <2>: Output Separators. (line 6) * OFS variable: Changing Fields. (line 64) -* OpenBSD: Glossary. (line 591) +* OpenBSD: Glossary. (line 594) * OpenSolaris: Other Versions. (line 86) * operating systems, BSD-based: Manual History. (line 28) * operating systems, PC, gawk on: PC Using. (line 6) @@ -26075,8 +26089,8 @@ Index * output, standard: Special FD. (line 6) * p debugger command (alias for print): Viewing And Changing Data. (line 36) -* P1003.1 POSIX standard: Glossary. (line 438) -* P1003.2 POSIX standard: Glossary. (line 438) +* P1003.1 POSIX standard: Glossary. (line 441) +* P1003.2 POSIX standard: Glossary. (line 441) * parameters, number of: Internals. (line 49) * parentheses (): Regexp Operators. (line 79) * parentheses (), pgawk program: Profiling. (line 141) @@ -26389,7 +26403,7 @@ Index * right angle bracket (>), >> operator (I/O): Redirection. (line 50) * right shift, bitwise: Bitwise Functions. (line 32) * Ritchie, Dennis: Basic Data Typing. (line 74) -* RLENGTH variable: Auto-set. (line 182) +* RLENGTH variable: Auto-set. (line 191) * RLENGTH variable, match() function and: String Functions. (line 194) * Robbins, Arnold <1>: Future Extensions. (line 6) * Robbins, Arnold <2>: Bugs. (line 32) @@ -26414,9 +26428,9 @@ Index * RS variable: Records. (line 20) * RS variable, multiline records and: Multiple Line. (line 17) * rshift() function (gawk): Bitwise Functions. (line 51) -* RSTART variable: Auto-set. (line 188) +* RSTART variable: Auto-set. (line 197) * RSTART variable, match() function and: String Functions. (line 194) -* RT variable <1>: Auto-set. (line 195) +* RT variable <1>: Auto-set. (line 204) * RT variable <2>: Getline/Variable/File. (line 10) * RT variable <3>: Multiple Line. (line 129) @@ -26719,7 +26733,7 @@ Index (line 6) * uniq utility: Uniq Program. (line 6) * uniq.awk program: Uniq Program. (line 65) -* Unix: Glossary. (line 591) +* Unix: Glossary. (line 594) * Unix awk, backslashes in escape sequences: Escape Sequences. (line 125) * Unix awk, close() function and: Close Files And Pipes. @@ -27042,224 +27056,224 @@ Node: Built-in Variables381978 Node: User-modified383073 Ref: User-modified-Footnote-1391074 Node: Auto-set391136 -Ref: Auto-set-Footnote-1400400 -Node: ARGC and ARGV400605 -Node: Arrays404364 -Node: Array Basics405935 -Node: Array Intro406646 -Node: Reference to Elements410964 -Node: Assigning Elements413234 -Node: Array Example413725 -Node: Scanning an Array415457 -Node: Delete418905 -Ref: Delete-Footnote-1421336 -Node: Numeric Array Subscripts421393 -Node: Uninitialized Subscripts423576 -Node: Multi-dimensional425204 -Node: Multi-scanning428295 -Node: Array Sorting429879 -Ref: Array Sorting-Footnote-1433077 -Node: Arrays of Arrays433271 -Node: Functions437810 -Node: Built-in438632 -Node: Calling Built-in439710 -Node: Numeric Functions441686 -Ref: Numeric Functions-Footnote-1445443 -Ref: Numeric Functions-Footnote-2445779 -Ref: Numeric Functions-Footnote-3445827 -Node: String Functions446096 -Ref: String Functions-Footnote-1467902 -Ref: String Functions-Footnote-2468031 -Ref: String Functions-Footnote-3468279 -Node: Gory Details468366 -Ref: table-sub-escapes470023 -Ref: table-posix-sub471337 -Ref: table-gensub-escapes472237 -Node: I/O Functions473408 -Ref: I/O Functions-Footnote-1480103 -Node: Time Functions480250 -Ref: Time Functions-Footnote-1491116 -Ref: Time Functions-Footnote-2491184 -Ref: Time Functions-Footnote-3491342 -Ref: Time Functions-Footnote-4491453 -Ref: Time Functions-Footnote-5491565 -Ref: Time Functions-Footnote-6491792 -Node: Bitwise Functions492058 -Ref: table-bitwise-ops492616 -Ref: Bitwise Functions-Footnote-1496776 -Node: Type Functions496960 -Node: I18N Functions497398 -Node: User-defined499025 -Node: Definition Syntax499829 -Ref: Definition Syntax-Footnote-1504466 -Node: Function Example504535 -Node: Function Caveats507129 -Node: Calling A Function507550 -Node: Variable Scope508665 -Node: Pass By Value/Reference510593 -Node: Return 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