Content-type: text/html Man page of file

file

Section: SunOS/BSD Compatibility Package Commands (1B)
Updated: 14 Sep 1992
Index Return to Main Contents
 

NAME

file - determine the type of a file by examining its contents  

SYNOPSIS

/usr/ucb/file [-f ffile] [-cL] [-m mfile] filename...  

DESCRIPTION

file performs a series of tests on each filename in an attempt to determine what it contains. If the contents of a file appear to be ASCII text, file examines the first 512 bytes and tries to guess its language.

file uses the file /etc/magic to identify files that have some sort of magic number, that is, any file containing a numeric or string constant that indicates its type.  

OPTIONS

-c Check for format errors in the magic number file. For reasons of efficiency, this validation is not normally carried out. No file type-checking is done under -c.

-f ffile Get a list of filenames to identify from ffile.

-L If a file is a symbolic link, test the file the link references rather than the link itself.

-m mfile Use mfile as the name of an alternate magic number file.

 

EXAMPLES

Example 1: Using file on all the files in a specific user's directory.

This example illustrates the use of file on all the files in a specific user's directory:

example% pwd
/usr/blort/misc

example% /usr/ucb/file  *

code:           mc68020 demand paged executable
code.c:         c program text
counts:         ascii text
doc:            roff,nroff, or eqn input text
empty.file:     empty
libz:           archive random library
memos:          directory
project:        symboliclink to /usr/project
script:         executable shell script
titles:         ascii text
s5.stuff:       cpio archive

example%
 

ENVIRONMENT VARIABLES

The environment variables LC_CTYPE, LANG, and LC_default control the character classification throughout file. On entry to file, these environment variables are checked in the following order: LC_CTYPE, LANG, and LC_default. When a valid value is found, remaining environment variables for character classification are ignored. For example, a new setting for LANG does not override the current valid character classification rules of LC_CTYPE. When none of the values is valid, the shell character classification defaults to the POSIX.1 "C" locale.  

FILES

/etc/magic  

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
AvailabilitySUNWscpu

 

SEE ALSO

magic(4), attributes(5)  

BUGS

file often makes mistakes. In particular, it often suggests that command files are C programs.

file does not recognize Pascal or LISP.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
ENVIRONMENT VARIABLES
FILES
ATTRIBUTES
SEE ALSO
BUGS

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Time: 02:39:15 GMT, October 02, 2010