TH FILE 1
SH NAME
file \- determine file type
SH SYNOPSIS
B file
[
B -m
]
[
I file
\&...
]
SH DESCRIPTION
I File
performs a series of tests on its argument
I files
in an attempt to classify their contents by language or purpose.
If no arguments are given, the classification is performed
on standard input.
PP
If the
B -m
flag is given,
I file
outputs an
appropriate MIME
B Content-Type
specification describing the
B type
and
B subtype
of each file.
PP
The file types it looks for include
directory,
device file,
zero-filled file,
empty file,
Plan 9 executable,
PAC audio file,
B cpio
archive,
B tex
B dvi
file,
archive symbol table,
archive,
B rc
script,
B sh
script,
PostScript,
B troff
output file for various devices,
GIF,
FAX,
object code,
C and Alef source,
assembler source,
compressed files,
encrypted file,
English text,
compressed image,
image,
subfont,
and
font.
PP
If a file has no apparent format,
I file
looks at the character set it uses to classify it according to
SM ASCII\c
,
extended
SM ASCII\c
, Latin
SM ASCII\c
, or
SM UTF
holding one or more of the following blocks of the Unicode Standard:
Extended Latin,
Greek,
Cyrillic,
Armenian,
Hebrew,
Arabic,
Devanagari,
Bengali,
Gurmukhi,
Gujarati,
Oriya,
Tamil,
Telugu,
Kannada,
Malayalam,
Thai,
Lao,
Tibetan,
Georgian,
Japanese,
Chinese,
or Korean.
PP
If all else fails,
I file
decides its input is
binary.
SH SOURCE
B /sys/src/cmd/file.c
SH BUGS
It can make mistakes, for example classifying a file of decimal data,
LR .01 ,
LR .02 ,
etc. as
IR troff (1)
input.

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