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207:, unaware of its existence, asked Thompson to write such a program. Responding that he would think about such a utility overnight, Thompson actually corrected bugs and made improvements for about an hour on his own program called
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editing, so
Thompson excerpted that regexp code into a standalone tool which would instead process arbitrarily long files sequentially without buffering too much into memory. He chose the name because in ed, the command
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A common verb usage is the phrase "You can't grep dead trees"—meaning one can more easily search through digital media, using tools such as
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This example generates a list of matches with the closest, that is those with the fewest, substitutions listed first. The command flag
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Other commands contain the word "grep" to indicate they are search tools, typically ones that rely on regular expression matches. The
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support but could not be used to search through such a large amount of text, as it loaded the entire file into memory to enable
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implementations are available in many operating systems and software development environments. Early variants included
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is the name of the built-in function that finds elements in a list that satisfy a certain property. This
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513:, but also any other word that can be derived from it, given no more than two substitutions.
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utility, for instance, displays the processes whose names match a given regular expression.
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QGREP.EXE A similar tool to grep in UNIX, this tool can be used to search for a text string
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A Research Unix reader: annotated excerpts from the
Programmer's Manual, 1971–1986
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Netizens: On the
History and Impact of Usenet and the Internet (Perspectives)
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320:. Binaries of these variants exist in modern systems, usually linking to
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or calling grep as a shell script with the appropriate flag added, e.g.
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1289:"InDesign: GREP Styles (1) Setting text between parentheses in Italic"
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syntax. Similar functionality can be invoked in the GNU version of
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1152:. Network professional's library. Osborne/McGraw-Hill. pp.
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utility for searching plaintext datasets for lines that match a
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696:, By Benjamin Rualthanzauva, Published on Feb 5, 2014, Medium
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dialog box "GREP" tab, and introduced with InDesign CS4 in
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would print all lines featuring a specified pattern match.
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Before it was named, grep was a private utility written by
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VCF East 2019 -- Brian
Kernighan interviews Ken Thompson
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Survey of Global
Regular Expression Print (GREP) Tools
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has functions GREP (since CS3 version (2007)), in the
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to determine authorship of the individual papers. The
308:'s original regular expression implementation. The "
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498:(approximate grep) matches even when the text only
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82:
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1498:- implementation details from GNU grep's author.
415:. Some versions of Windows feature the similar
1338:S. Lee Henry (June 1998). "Proper Searching".
1234:"Review: Adobe InDesign CS3 - CreativePro.com"
260:prototypical software tool", McIlroy credited
183:operating system, but later available for all
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1522:
1205:"IBM System i Version 7.2 Programming Qshell"
8:
1419:Proceedings of the EUUG Spring 88 Conference
920:Hume, Andrew (1988). "A Tale of Two Greps".
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1415:Grep wars: The strategic search initiative.
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887:(Technical report). CSTR. Bell Labs. 139.
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909:(Technical report). Dalhousie University.
905:Abou-Assaleh, Tony; Wei Ai (March 2004).
870:
868:
264:with "irrevocably ingraining" Thompson's
256:. Stating that it is "generally cited as
16:Unix command line utility for text search
589:, an approximate string-matching command
545:added "grep" as both a noun and a verb.
312:" variant searches for any of a list of
641:
459:commands have also been ported to the
318:Aho–Corasick string matching algorithm
203:to search files for certain patterns.
1432:. Wiley-IEEE Computer Society Press.
1125:from the original on 10 December 2015
1095:from the original on 23 December 2015
1035:from the original on 22 December 2015
1005:from the original on 28 November 2015
7:
1502:Command Grep – 25 practical examples
1065:from the original on 7 December 2015
574:Free and open-source software portal
214:Thompson wrote the first version in
2635:Inferno (operating system) commands
1244:from the original on 5 January 2018
582:Boyer–Moore string-search algorithm
750:The OS-9 Guru - 1 : The Facts
14:
975:from the original on 4 March 2016
961:. Elsevier Science. p. 278.
922:Software: Practice and Experience
179:was originally developed for the
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894:from the original on 2017-11-11.
782:from the original on 2021-12-11.
658:The Unix Programming Environment
566:
505:This following invocation finds
377:command is an implementation of
235:(also authored by Thompson) had
187:systems and some others such as
1320:from the original on 2016-08-28
1295:from the original on 2017-09-24
1270:from the original on 2016-08-28
955:Meurant, Gerard (12 Sep 1990).
752:. Galactic Industrial Limited.
2615:Unix text processing utilities
1395:Alain Magloire (August 2000).
1354:"New words list December 2003"
778:(video). YouTube. 6 May 2019.
411:, for example) also run under
1:
1475:Programmer's Manual, Volume 1
1397:Grep: Searching for a Pattern
1428:; et al. (April 1997).
1417:In Peter Collinson, editor,
1314:"InDesign Help: GREP styles"
1264:"InDesign Help: find/change"
1148:Windows 2000 administration
1091:. University of Cambridge.
298:extended regular expression
70:; 50 years ago
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662:. Prentice Hall. pp.
485:
167:. Its name comes from the
59:AT&T Bell Laboratories
2583:
2134:
1455:GNU Grep official website
1381:, article "Documentation"
1358:Oxford English Dictionary
1144:Spalding, George (2000).
958:Algorithms and Complexity
705:Hauben et al. 1997, Ch. 9
654:Kernighan, Brian (1984).
541:Oxford English Dictionary
530:agrep -B netmasks myfile
516:agrep -2 netmasks myfile
502:fits the search pattern.
24:
432:command is also part of
843:"How Grep Got its Name"
383:Perl regular expression
2625:Standard Unix programs
2620:Unix SUS2008 utilities
2213:command-line interface
2154:Unix SUS2008 utilities
2149:Standard Unix programs
1541:command-line interface
1496:"why GNU grep is fast"
999:www.pubs.opengroup.org
934:10.1002/spe.4380181105
748:Paul S. Dayan (1992).
538:In December 2003, the
352:programming language,
296:" variant supports an
252:was first included in
2640:IBM i Qshell commands
847:robots.thoughtbot.com
615:List of Unix commands
358:higher-order function
228:The Federalist Papers
2511:Software development
2042:Software development
1059:www.perldoc.perl.org
796:Where GREP Came From
370:in other languages.
225:analyze the text of
1085:"pcregrep man page"
360:is typically named
21:
1001:. The Open Group.
823:on 20 October 2017
692:2015-05-26 at the
632:, the network grep
463:operating system.
326:exec grep -E "$ @"
316:strings using the
237:regular expression
165:regular expression
68:November 1973
42:Original author(s)
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2601:
2176:
2175:
1489:General commands
1439:978-0-8186-7706-9
1399:. Iuniverse Inc.
1342:. pp. 35–26.
1240:. 20 April 2007.
1163:978-0-07-882582-8
1119:www.linux.die.net
1029:www.linux.die.net
799:, interview with
413:Microsoft Windows
219:assembly language
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853:on 9 August 2017
849:. Archived from
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486:Main article:
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468:Adobe InDesign
438:MSX-DOS2 Tools
290:Version 7 Unix
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254:Version 4 Unix
233:ed text editor
223:Lee E. McMahon
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135:Cross-platform
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2555:
2553:Miscellaneous
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2218:
2215:programs and
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2199:
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2109:
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2089:Miscellaneous
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2056:
2053:
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2027:
2025:Documentation
2023:
2017:
2014:
2012:
2009:
2008:
2006:
2002:
1996:
1993:
1991:
1988:
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1546:
1543:programs and
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1497:
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1471: –
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1416:
1413:Hume, Andrew
1412:
1408:
1406:0-595-10039-2
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1189:. April 1993.
1188:
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968:9780080933917
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769:
766:
761:
759:0-9519228-0-7
755:
751:
744:
741:
730:on 2006-06-17
729:
725:
721:
717:
716:Raymond, Eric
711:
708:
702:
699:
695:
691:
688:
683:
680:
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673:0-13-937681-X
669:
665:
660:
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642:
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631:
628:
622:, or "visual
621:
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512:
508:
503:
501:
500:approximately
497:
495:
489:
481:
479:
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469:
466:The software
464:
462:
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426:
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414:
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384:
371:
364:
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319:
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307:
303:
299:
291:
276:A variety of
271:
269:
267:
259:
255:
247:
242:
241:random access
238:
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224:
220:
217:
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194:
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170:
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1429:
1418:
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1372:
1361:. Retrieved
1357:
1348:
1339:
1333:
1322:. Retrieved
1308:
1297:. Retrieved
1283:
1272:. Retrieved
1258:
1246:. Retrieved
1237:
1228:
1217:. Retrieved
1211:
1195:
1181:
1173:
1167:. Retrieved
1147:
1139:
1127:. Retrieved
1118:
1109:
1097:. Retrieved
1089:www.pcre.org
1088:
1079:
1067:. Retrieved
1058:
1049:
1037:. Retrieved
1028:
1019:
1007:. Retrieved
998:
989:
977:. Retrieved
957:
950:
928:(11): 1063.
925:
921:
915:
906:
900:
880:
855:. Retrieved
851:the original
846:
837:
825:. Retrieved
821:the original
816:
813:"ed regexes"
807:
794:
789:
774:
768:
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743:
732:. Retrieved
728:the original
723:
710:
701:
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556:for paper).
547:
539:
537:
524:
520:
518:
510:
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504:
499:
493:
492:
491:
475:
471:
465:
446:
437:
427:
395:
372:
353:
347:
338:
313:
306:Ken Thompson
275:
257:
245:
226:
213:
205:Doug McIlroy
201:Ken Thompson
198:
161:command-line
154:
153:
54:Developer(s)
47:Ken Thompson
2475:ip/ipconfig
2224:File system
1552:File system
1378:Jargon File
1129:12 December
1099:12 December
1069:12 December
1039:12 December
1009:12 December
979:12 December
724:Jargon File
606:find (Unix)
472:find/change
444:version 2.
31:Example of
2609:Categories
2467:Networking
2144:Categories
1363:2021-12-06
1340:Sun Expert
1324:2016-08-12
1299:2018-01-05
1274:2016-08-12
1219:2020-09-05
1169:2010-12-10
1025:"pgrep(1)"
734:2006-06-29
637:References
554:dysphemism
381:that uses
302:Alfred Aho
83:Written in
2494:Searching
2310:Processes
2004:Searching
1693:Processes
1115:"grep(1)"
784:(35 mins)
425:command.
389:with the
268:in Unix.
185:Unix-like
103:Unix-like
2594:Category
2364:basename
1812:basename
1318:Archived
1293:Archived
1268:Archived
1248:24 April
1242:Archived
1123:Archived
1093:Archived
1063:Archived
1033:Archived
1003:Archived
973:Archived
889:Archived
878:(1987).
857:24 April
827:24 April
780:Archived
690:Archived
560:See also
509:in file
507:netmasks
409:GnuWin32
403:(within
375:pcregrep
221:to help
171:command
130:Platform
2570:fortune
2485:netstat
2480:ip/ping
2409:strings
1917:strings
1837:dirname
1761:logname
1710:crontab
1487:Inferno
1481:grep(1)
1467:grep(1)
942:6395770
597:Findstr
442:MSX-DOS
422:findstr
348:In the
292:. The "
195:History
147:Command
119:MSX-DOS
111:Inferno
75:1973-11
73: (
35:command
2592:
2338:passwd
2210:Plan 9
1897:printf
1822:csplit
1564:chattr
1491:Manual
1473:Plan 9
1436:
1403:
1160:
1055:"grep"
995:"grep"
965:
940:
756:
720:"grep"
670:
543:Online
523:means
511:myfile
455:, and
405:Cygwin
393:flag.
363:filter
304:after
246:g/re/p
216:PDP-11
173:g/re/p
107:Plan 9
2575:sleep
2539:strip
2424:troff
2404:spell
2301:touch
2291:split
2276:mkdir
2236:chgrp
2231:chmod
2121:sleep
2075:strip
2055:ctags
1990:unset
1970:alias
1952:xargs
1932:troff
1892:patch
1887:paste
1862:iconv
1791:write
1781:uname
1684:umask
1674:touch
1664:split
1659:rmdir
1634:mkdir
1619:fuser
1584:cksum
1579:chgrp
1574:chown
1569:chmod
1388:Notes
1208:(PDF)
938:S2CID
892:(PDF)
885:(PDF)
630:ngrep
620:vgrep
587:agrep
488:agrep
482:agrep
461:IBM i
457:fgrep
453:egrep
434:ASCII
417:qgrep
397:Ports
368:where
342:pgrep
334:fgrep
330:egrep
314:fixed
310:fgrep
294:egrep
286:fgrep
282:egrep
159:is a
123:IBM i
2544:yacc
2501:grep
2457:test
2452:echo
2429:uniq
2414:tail
2399:sort
2389:join
2374:diff
2369:comm
2317:kill
2266:gzip
2261:file
2167:List
2106:expr
2080:yacc
2065:make
2016:grep
2011:find
1995:wait
1985:test
1980:echo
1937:uniq
1922:tail
1912:sort
1902:read
1877:more
1867:join
1857:head
1852:fold
1832:diff
1817:comm
1776:tput
1771:talk
1766:mesg
1756:exit
1735:time
1725:nice
1720:kill
1679:type
1614:file
1538:Unix
1434:ISBN
1401:ISBN
1250:2018
1158:ISBN
1131:2015
1101:2015
1071:2015
1041:2015
1011:2015
981:2015
963:ISBN
859:2018
829:2018
754:ISBN
668:ISBN
624:grep
610:grep
601:grep
550:grep
525:best
496:grep
449:grep
447:The
440:for
430:grep
407:and
401:grep
387:grep
379:grep
373:The
354:grep
350:Perl
332:and
322:grep
284:and
278:grep
262:grep
250:grep
189:OS-9
181:Unix
177:grep
156:grep
142:Type
115:OS-9
99:Unix
33:grep
20:grep
2565:cal
2529:lex
2524:hoc
2394:sed
2384:eqn
2359:awk
2343:who
2296:tee
2281:pwd
2241:cmp
2101:cal
2060:lex
2032:man
1907:sed
1827:cut
1807:awk
1786:who
1751:env
1669:tee
1649:pwd
1644:pax
1589:cmp
1559:cat
1213:IBM
1201:IBM
1154:634
930:doi
664:102
595:or
436:'s
419:or
399:of
366:or
258:the
2611::
2560:bc
2534:nm
2519:ar
2434:wc
2419:tr
2379:ed
2322:ps
2286:rm
2271:ls
2256:du
2251:dd
2246:cp
2116:od
2111:lp
2096:bc
2070:nm
2050:ar
1975:cd
1947:wc
1942:vi
1927:tr
1882:nl
1872:m4
1847:ex
1842:ed
1730:ps
1715:fg
1705:bg
1700:at
1654:rm
1639:mv
1629:ls
1624:ln
1609:df
1604:du
1599:dd
1594:cp
1356:.
1316:.
1291:.
1266:.
1236:.
1210:.
1203:.
1172:.
1156:.
1121:.
1117:.
1087:.
1061:.
1057:.
1031:.
1027:.
997:.
971:.
936:.
926:18
924:.
867:^
845:.
815:.
722:.
718:.
666:.
644:^
527::
451:,
428:A
391:-P
328:.
191:.
169:ed
121:,
117:,
113:,
109:,
105:,
101:,
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2188:v
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1366:.
1327:.
1302:.
1277:.
1252:.
1222:.
1133:.
1103:.
1073:.
1043:.
1013:.
983:.
944:.
932::
861:.
831:.
762:.
737:.
676:.
626:"
521:B
494:a
209:s
87:C
77:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
