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Full Discussion: Help about "file" cmd
Top Forums UNIX for Dummies Questions & Answers Help about "file" cmd Post 302674951 by yanglei_fage on Saturday 21st of July 2012 01:50:16 AM
Old 07-21-2012
Quote:
Originally Posted by jim mcnamara
file command uses (/etc/magic or /usr/share/magic or /usr/share/file/magic) and reads the first few bytes of the file. It then tries to decode The first n bytes and then does a lookup on those bytes in the magic file. The text you see is in the magic file.

The size of n depends on the OS.
But I can't find where tell "2.6.16"
 

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LEARN ABOUT MOJAVE

cgen

fileutil::magic::cgen(n)					  file utilities					  fileutil::magic::cgen(n)

__________________________________________________________________________________________________________________________________________________

NAME

       fileutil::magic::cgen - Generator core for compiler of magic(5) files

SYNOPSIS

       package require Tcl  8.4

       package require fileutil::magic::cgen  ?1.0?

       package require fileutil::magic::rt  ?1.0?

       package require struct::tree

       package require struct::list

       ::fileutil::magic::cgen::2tree script

       ::fileutil::magic::cgen::treedump tree

       ::fileutil::magic::cgen::treegen tree node

_________________________________________________________________

DESCRIPTION

       This  package  provides the generator backend for a compiler of magic(5) files into recognizers based on the fileutil::magic::rt recognizer
       runtime package. For the compiler frontend using this generator see the package fileutil::magic::cfront.

COMMANDS

       ::fileutil::magic::cgen::2tree script
	      This command converts the recognizer specified by the script into a tree and returns the object command of that tree as its  result.
	      It uses the package struct::tree for the tree.

	      The script is in the format specified by magic(5).

       ::fileutil::magic::cgen::treedump tree
	      This  command  takes a tree as generated by ::fileutil::magic::cgen::2tree and returns a string encoding the tree for human consump-
	      tion, to aid in debugging.

       ::fileutil::magic::cgen::treegen tree node
	      This command takes a tree as generated by ::fileutil::magic::cgen::2tree and returns a Tcl script, the recognizer for the file types
	      represented by the sub-tree rooted at the node.  The generated script makes extensive use of the commands provided by the recognizer
	      runtime package fileutil::magic::rt to perform its duties.

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the category fileutil
       :: magic of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may
       have for either package and/or documentation.

SEE ALSO

       file(1), fileutil, magic(5)

KEYWORDS

       file recognition, file type, file utilities, mime, type

CATEGORY

       Programming tools

fumagic 								1.0						  fileutil::magic::cgen(n)
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