113 lines
1.4 KiB
Plaintext
113 lines
1.4 KiB
Plaintext
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.TH FILE 1
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.SH NAME
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file \- determine file type
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.SH SYNOPSIS
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.B file
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[
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.B -m
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]
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[
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.I file
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\&...
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]
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.SH DESCRIPTION
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.I File
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performs a series of tests on its argument
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.I files
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in an attempt to classify their contents by language or purpose.
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If no arguments are given, the classification is performed
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on standard input.
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.PP
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If the
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.B -m
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flag is given,
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.I file
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outputs an
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appropriate MIME
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.B Content-Type
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specification describing the
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.B type
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and
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.B subtype
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of each file.
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.PP
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The file types it looks for include
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directory,
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device file,
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zero-filled file,
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empty file,
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Plan 9 executable,
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PAC audio file,
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.B cpio
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archive,
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.B tex
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.B dvi
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file,
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archive symbol table,
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archive,
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.B rc
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script,
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.B sh
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script,
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PostScript,
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.B troff
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output file for various devices,
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mail box,
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GIF,
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FAX,
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object code,
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C and Alef source,
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assembler source,
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compressed files,
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encrypted file,
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English text,
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compressed image,
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image,
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subfont,
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and
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font.
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.PP
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If a file has no apparent format,
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.I file
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looks at the character set it uses to classify it according to
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.SM ASCII\c
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,
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extended
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.SM ASCII\c
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, Latin
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.SM ASCII\c
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, or
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.SM UTF
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holding one or more of the following blocks of the Unicode Standard:
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Extended Latin,
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Greek,
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Cyrillic,
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Armenian,
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Hebrew,
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Arabic,
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Devanagari,
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Bengali,
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Gurmukhi,
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Gujarati,
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Oriya,
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Tamil,
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Telugu,
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Kannada,
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Malayalam,
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Thai,
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Lao,
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Tibetan,
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Georgian,
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Japanese,
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Chinese,
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or Korean.
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.PP
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If all else fails,
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.I file
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decides its input is
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binary.
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.SH SOURCE
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.B /sys/src/cmd/file.c
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.SH BUGS
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It can make mistakes.
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