38:
2339:
1890:
1912:
530:
looks at the content). It is easy to fool the program by putting a magic number into a file the content of which does not match it. Thus the command is not usable as a security tool other than in specific situations.
258:
brought a major update with several important changes, most notably moving the file type information into an external text file rather than compiling it into the binary itself.
285:
in 1989 and since then has had input from many others, including Guy Harris, Chris Lowth and Eric
Fischer; from late 1993 onward its maintenance has been organized by
891:
430:, specify a file specially formatted containing position-sensitive tests; default position-sensitive tests and context-sensitive tests will not be performed.
179:
1950:
838:
1278:
923:
293:
system has its own subset implementation written from scratch, but still uses the Darwin/Zoulas collection of magic file formatted information.
483:, do not classify the file further than to identify it as either: nonexistent, a block special file, a character special file, a directory, a
281:
from scratch; it keeps file type information in a text file with a format based on that of the System V version. It was expanded by
381:'s position-sensitive tests are normally implemented by matching various locations within the file against a textual database of
487:, a socket, a symbolic link, or a regular file. Linux and BSD systems behave differently with this option and instead output an
2369:
2364:
1903:
1898:
1081:
1050:
2379:
561:
861:
1943:
453:, perform default position-sensitive and context-sensitive tests to the given file; this is the default behaviour unless
753:
91:
1271:
878:
633:
to read device files and try to identify their contents rather than merely identifying them as device files. Normally
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582:
382:
2309:
2229:
1875:
1845:
1114:
313:
56:
2374:
2343:
1936:
1860:
810:
546:
114:
400:
command uses a database to drive the probing of the lead bytes. That database is implemented in a file called
1928:
251:
75:
1962:
1916:
1621:
1290:
1264:
1256:
1959:
1209:
567:
134:
915:
1108:
2260:
1791:
1739:
286:
274:
834:
806:
488:
396:
In the System V implementation, the Ian Darwin implementation, and the OpenBSD implementation, the
216:
157:
1464:
1454:
343:
335:
145:
668:
the program does not stop after the first hit found, but looks for other matching patterns. The
316:(SUS) specifies that a series of tests are performed on the file specified on the command line:
278:
637:
does not try to read device files since reading such a file can have undesirable side effects.
654:
231:
2128:
1691:
1596:
1591:
749:
697:
689:
220:
170:
121:
24:
629:
Note that -s is a non-standard option available only on the Ian Darwin branch, which tells
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1966:
1850:
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operating systems may add extra options than these. Ian Darwin's implementation adds
468:
282:
270:
235:
1253:, an alternative providing ranked answers (instead of just one) based on statistics.
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676:
character to be displayed in its raw form rather than in its octal representation.
590:
760:): Mach-O executable ppc /bin/cat (for architecture i386): Mach-O executable i386
858:
The early history of this program is recorded in its private CVS repository; see
2206:
2163:
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2138:
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1616:
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721:
696:, original filename, `compressed', last modified: Thu Jan 26 14:08:23 2006,
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601:
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347:
328:
program will indicate that the file was processed but its type was undetermined.
184:
175:
19:"File (software)" redirects here. For the file management program bundled with
2092:
1990:
1576:
1535:
1338:
1308:
1212:
Programmer's Manual, Volume 1 – a non-Ian Darwin, non-SUS implementation
713:
624:
570:
484:
339:
51:
477:, dereference the symbolic link that points to an existing file or directory.
2283:
2268:
2183:
2168:
2071:
2035:
2005:
2000:
1995:
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1403:
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504:
228:
162:
130:
1113:: determine file type – Shell and Utilities Reference,
2224:
2113:
1781:
1561:
1247:, a firmware analysis tool that carves files based on libmagic signatures
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1177:
1160:
1142:
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1005:
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385:(see the Usage section). This differs from other simpler methods such as
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20:
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option, which is available in some versions, causes the unprintable
443:, but default tests will be performed after the tests contained in
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1980:
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As of version 4.00 of the Ian Darwin/Christos Zoulas version of
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1260:
97:
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is not available on all platforms and will be dereferenced if
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120:
110:
90:
62:
50:
43:
277:reimplementation which was written in 1986–87 by
234:for recognizing the type of data contained in a
657:: Debian binary package (format 2.0) - current
916:"The Open Group Base Specifications Issue 7 —
495:type") identifying the recognized file format.
1944:
1272:
1225:– homepage for Ian Darwin's version of
879:"IBM System i Version 7.2 Programming Qshell"
8:
471:that point to an existing file or directory.
30:
1229:used in major BSD and Linux distributions.
519:'raw' (examples below), among many others.
1951:
1937:
1929:
1911:
1279:
1265:
1257:
356:an initial part of file is considered and
36:
29:
664:Through Ian Darwin's non-standard option
420:The SUS mandates the following options:
353:zero-length files are identified as such
1198:– a non-Ian Darwin implementation
942:
940:
835:"Source of the UNIX V4 "file" man page"
826:
1084:from the original on December 28, 2016
1041:Zoulas, Christos (February 27, 2003).
644:file-k-rlibmagic-dev_5.35-4_armhf.deb
522:The command tells only what the file
7:
526:, not what it is (in the case where
334:must be able to determine the types
300:command has also been ported to the
1072:Zoulas, Christos (March 24, 2003).
817:is implemented using that library.
320:if the file cannot be read, or its
1053:from the original on March 4, 2016
363:the entire file is considered and
360:is to use position-sensitive tests
14:
769:/usr/bin/vi: symbolic link to vim
367:is to use context-sensitive tests
2338:
2337:
1910:
1889:
1888:
926:from the original on 2018-10-12
897:from the original on 2021-03-05
841:from the original on 2019-12-10
404:, whose location is usually in
1:
1115:The Single UNIX Specification
1074:"file-4.00 is now available"
1043:"file-3.41 is now available"
813:(and C-compatible) linking;
370:the file is identified as a
350:, and character special file
86:open-source reimplementation
868:the log of the main program
756:/bin/cat (for architecture
2396:
57:AT&T Bell Laboratories
18:
2333:
1884:
314:Single UNIX Specification
35:
762:
246:The original version of
809:that is accessible via
802:is incorporated into a
798:, the functionality of
412:or a similar location.
252:Unix Research Version 4
76:Unix Research Version 4
2370:Unix SUS2008 utilities
2365:Standard Unix programs
1963:command-line interface
1904:Unix SUS2008 utilities
1899:Standard Unix programs
1291:command-line interface
1223:Fine Free File Command
2380:IBM i Qshell commands
736:"rawbits" image data
467:, do not dereference
410:/usr/share/file/magic
324:is undetermined, the
16:Standard Unix program
2261:Software development
1792:Software development
649:libmagic-dev_5.35-4_
269:distributions use a
1180:– Library Functions
1008:– Library Functions
707:file-icompressed.gz
489:Internet media type
32:
1159:Library Functions
1028:Library Functions
864:2017-04-01 at the
714:application/x-gzip
583:dynamically linked
304:operating system.
2352:
2351:
1926:
1925:
1194:General Commands
1117:, Version 4 from
981:General Commands
683:filecompressed.gz
617:/dev/hda1: Linux/
511:'special files',
389:and schemes like
232:operating systems
208:
207:
42:Example usage of
2387:
2341:
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2081:User environment
1953:
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1939:
1930:
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1494:User environment
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1111:
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1080:(Mailing list).
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1049:(Mailing list).
1038:
1032:
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805:
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797:
790:Libmagic library
770:
767:file/usr/bin/vi
766:
750:universal binary
744:
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729:
711:
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706:
684:
682:
648:
647:
643:
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616:
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559:
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515:'keep-going' or
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122:Operating system
106:
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85:
83:
73:
71:
45:
40:
33:
25:Files (software)
2395:
2394:
2390:
2389:
2388:
2386:
2385:
2384:
2375:Plan 9 commands
2355:
2354:
2353:
2348:
2329:
2298:
2255:
2239:
2211:
2188:
2102:Text processing
2097:
2076:
2055:
1969:
1957:
1927:
1922:
1880:
1834:
1786:
1770:
1749:
1706:
1550:Text processing
1545:
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1297:
1285:
1226:
1219:
1202:
1201:
1184:
1183:
1166:
1165:
1149:
1148:
1145:– User Commands
1131:
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965:
961:– User Commands
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866:Wayback Machine
857:
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844:
842:
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832:
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784:POSIXLY_CORRECT
781:
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724:
712:compressed.gz:
708:
704:
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685:compressed.gz:
680:
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661:archive - data
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615:file-s/dev/hda1
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397:
387:file extensions
378:
371:
364:
357:
331:
325:
310:
287:Christos Zoulas
247:
244:
212:
194:
182:
96:
81:
79:
69:
67:
63:Initial release
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28:
17:
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2198:
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2194:Shell builtins
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2176:
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2023:
2018:
2013:
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2003:
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1993:
1988:
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1970:
1967:shell builtins
1958:
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1712:Shell builtins
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1295:shell builtins
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1199:
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1123:
1122:
1121:
1119:The Open Group
1102:
1101:External links
1099:
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1010:
986:
963:
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870:
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824:
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776:symbolic links
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469:symbolic links
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329:
322:Unix file type
309:
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250:originated in
243:
240:
219:is a standard
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173:
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151:Cross-platform
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2303:Miscellaneous
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2019:
2017:
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2012:
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2002:
1999:
1997:
1994:
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1989:
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1984:
1982:
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1968:
1965:programs and
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1839:Miscellaneous
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308:Specification
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1233:mailing list
1125:Manual pages
1086:. Retrieved
1077:
1067:
1055:. Retrieved
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1036:
1013:
989:
966:
928:. Retrieved
917:
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899:. Retrieved
885:
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843:. Retrieved
829:
793:
774:Identifying
773:
743:file/bin/cat
730:filedata.ppm
709:# (on Linux)
663:
646:# (on Linux)
628:
550:program text
527:
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426:
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348:special file
311:
295:
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52:Developer(s)
2225:ip/ipconfig
1974:File system
1302:File system
1168:libmagic(3)
1151:libmagic(3)
1020:libmagic(3)
996:libmagic(3)
587:shared libs
575:Intel 80386
558:fileprogram
275:open-source
261:Most major
185:MIT License
176:BSD license
74:as part of
2359:Categories
2217:Networking
1894:Categories
1088:January 1,
1057:January 1,
930:2014-08-20
901:2020-09-05
845:2022-03-13
821:References
745:/bin/cat:
734:Netpbm PPM
732:data.ppm:
690:compressed
625:filesystem
571:executable
543:filefile.c
524:looks like
406:/etc/magic
279:Ian Darwin
111:Written in
92:Repository
2244:Searching
2060:Processes
1754:Searching
1443:Processes
560:program:
505:Unix-like
439:, as for
336:directory
254:in 1973.
229:Unix-like
196:darwinsys
163:File type
131:Unix-like
2344:Category
2114:basename
1562:basename
1238:releases
1082:Archived
1051:Archived
924:Archived
920:command"
892:Archived
862:Archived
839:Archived
804:libmagic
786:is set.
694:deflated
674:new line
602:/dev/hda
591:stripped
545:file.c:
535:Examples
346:, block
256:System V
183:Plan 9:
165:detector
146:Platform
2320:fortune
2235:netstat
2230:ip/ping
2159:strings
1667:strings
1587:dirname
1511:logname
1460:crontab
1245:binwalk
1204:file(1)
1192:OpenBSD
1186:file(1)
1133:file(1)
973:file(1)
949:file(1)
807:library
758:ppc7400
752:with 2
718:charset
700:: Unix
291:OpenBSD
242:History
221:program
217:command
191:Website
171:License
80: (
68: (
2342:
2088:passwd
1960:Plan 9
1647:printf
1572:csplit
1314:chattr
1210:Plan 9
1196:Manual
1178:Manual
1161:Manual
1157:NetBSD
1143:Manual
1030:Manual
1026:NetBSD
1006:Manual
983:Manual
979:NetBSD
959:Manual
747:Mach-O
722:binary
692:data,
608:(0/0)
585:(uses
565:32-bit
499:Other
344:socket
289:. The
135:Plan 9
98:github
78:; 1986
23:, see
21:iOS 11
2325:sleep
2289:strip
2174:troff
2154:spell
2051:touch
2041:split
2026:mkdir
1986:chgrp
1981:chmod
1871:sleep
1825:strip
1805:ctags
1740:unset
1720:alias
1702:xargs
1682:troff
1642:patch
1637:paste
1612:iconv
1541:write
1531:uname
1434:umask
1424:touch
1414:split
1409:rmdir
1384:mkdir
1369:fuser
1334:cksum
1329:chgrp
1324:chown
1319:chmod
1217:Other
1174:Linux
1141:User
1139:Linux
1002:Linux
957:User
955:Linux
895:(PDF)
882:(PDF)
651:armhf
416:Usage
402:magic
302:IBM i
267:Linux
200:/file
139:IBM i
104:/file
102:/file
2294:yacc
2251:grep
2207:test
2202:echo
2179:uniq
2164:tail
2149:sort
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2124:diff
2119:comm
2067:kill
2016:gzip
2011:file
1917:List
1856:expr
1830:yacc
1815:make
1766:grep
1761:find
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1526:tput
1521:talk
1516:mesg
1506:exit
1485:time
1475:nice
1470:kill
1429:type
1364:file
1288:Unix
1251:TrID
1227:file
1109:file
1090:2013
1078:File
1059:2013
1047:File
918:file
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800:file
796:file
687:gzip
635:file
631:file
622:ext2
619:i386
599:file
579:SYSV
528:file
503:and
501:Unix
493:MIME
485:FIFO
445:file
436:file
427:file
398:file
391:MIME
379:file
374:file
372:data
365:file
358:file
340:FIFO
332:file
326:file
312:The
298:file
296:The
271:free
265:and
248:file
227:and
225:Unix
213:file
210:The
198:.com
180:CDDL
158:Type
127:Unix
100:.com
82:1986
70:1973
66:1973
44:file
31:file
2315:cal
2279:lex
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2144:sed
2134:eqn
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2093:who
2046:tee
2031:pwd
1991:cmp
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887:IBM
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27:.
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