plan9 man page for file

FILE(1) 						      General Commands Manual							   FILE(1)

NAME
       file - determine file type

SYNOPSIS
       file [ file ...	]

DESCRIPTION
       File performs a series of tests on its argument files in an attempt to classify their contents by language or purpose.  If no arguments are
       given, the classification is performed on standard input.

       The file types it looks for include directory, device file, zero-filled file, empty file, Plan 9 executable, PAC audio file, cpio  archive,
       tex  dvi  file,	archive  symbol  table,  archive,  rc script, sh script, PostScript, troff output file for various devices, GIF, FAX, pic-
       file(9.6), object code, C and Alef source, assembler source, compressed files, encrypted file, English text, Plan 9 bitmap, Plan 9 subfont,
       Plan 9 font.

       If  a  file has no apparent format, file looks at the character set it uses to classify it according to ASCII, extended ASCII, Latin ASCII,
       or 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.

       If all else fails, file decides its input is binary.

SOURCE
       /sys/src/cmd/file.c

BUGS
       It can make mistakes, for example classifying a file of decimal data, etc. as troff(1) input.

																	   FILE(1)