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SunOS/BSD Compatibility Package Commandsfile(1B)


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.


SunOS 5.9Go To TopLast Changed 14 Sep 1992

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.