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Member "file-5.35/README" (11 Sep 2018, 6923 Bytes) of package /linux/misc/file-5.35.tar.gz:


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    1 ## README for file(1) Command ##
    2 
    3     @(#) $File: README,v 1.56 2018/09/09 20:33:28 christos Exp $
    4 
    5 Mailing List: file@astron.com
    6 Mailing List archives: http://mailman.astron.com/pipermail/file/
    7 Bug tracker: http://bugs.astron.com/
    8 E-mail: christos@astron.com
    9 Build Status: https://travis-ci.org/file/file
   10 
   11 Phone: Do not even think of telephoning me about this program. Send cash first!
   12 
   13 This is Release 5.x of Ian Darwin's (copyright but distributable)
   14 file(1) command, an implementation of the Unix File(1) command.
   15 It knows the 'magic number' of several thousands of file types.
   16 This version is the standard "file" command for Linux,
   17 *BSD, and other systems. (See "patchlevel.h" for the exact release number).
   18 
   19 You can download the latest version of the original sources for file from:
   20 
   21 	ftp://ftp.astron.com/pub/file/
   22 
   23 A public read-only git repository of the same sources is available at:
   24 
   25 	https://github.com/file/file
   26 
   27 The major changes for 5.x are CDF file parsing, indirect magic, name/use
   28 (recursion) and overhaul in mime and ascii encoding handling.
   29 
   30 The major feature of 4.x is the refactoring of the code into a library,
   31 and the re-write of the file command in terms of that library. The library
   32 itself, libmagic can be used by 3rd party programs that wish to identify
   33 file types without having to fork() and exec() file. The prime contributor
   34 for 4.0 was Mans Rullgard.
   35 
   36 UNIX is a trademark of UNIX System Laboratories.
   37 
   38 The prime contributor to Release 3.8 was Guy Harris, who put in megachanges
   39 including byte-order independence.
   40 
   41 The prime contributor to Release 3.0 was Christos Zoulas, who put
   42 in hundreds of lines of source code changes, including his own
   43 ANSIfication of the code (I liked my own ANSIfication better, but
   44 his (__P()) is the "Berkeley standard" way of doing it, and I wanted UCB
   45 to include the code...), his HP-like "indirection" (a feature of
   46 the HP file command, I think), and his mods that finally got the
   47 uncompress (-z) mode finished and working.
   48 
   49 This release has compiled in numerous environments; see PORTING
   50 for a list and problems.
   51 
   52 This fine freeware file(1) follows the USG (System V) model of the file
   53 command, rather than the Research (V7) version or the V7-derived 4.[23]
   54 Berkeley one. That is, the file /etc/magic contains much of the ritual
   55 information that is the source of this program's power. My version
   56 knows a little more magic (including tar archives) than System V; the
   57 /etc/magic parsing seems to be compatible with the (poorly documented)
   58 System V /etc/magic format (with one exception; see the man page).
   59 
   60 In addition, the /etc/magic file is built from a subdirectory
   61 for easier(?) maintenance.  I will act as a clearinghouse for
   62 magic numbers assigned to all sorts of data files that
   63 are in reasonable circulation. Send your magic numbers,
   64 in magic(5) format please, to the maintainer, Christos Zoulas.
   65 
   66 COPYING - read this first.
   67 README - read this second (you are currently reading this file).
   68 INSTALL - read on how to install
   69 src/apprentice.c - parses /etc/magic to learn magic
   70 src/apptype.c - used for OS/2 specific application type magic
   71 src/ascmagic.c - third & last set of tests, based on hardwired assumptions.
   72 src/asctime_r.c - replacement for OS's that don't have it.
   73 src/asprintf.c - replacement for OS's that don't have it.
   74 src/asctime_r.c - replacement for OS's that don't have it.
   75 src/asprintf.c - replacement for OS's that don't have it.
   76 src/buffer.c - buffer handling functions.
   77 src/cdf.[ch] - parser for Microsoft Compound Document Files
   78 src/cdf_time.c - time converter for CDF.
   79 src/compress.c - handles decompressing files to look inside.
   80 src/ctime_r.c - replacement for OS's that don't have it.
   81 src/der.[ch] - parser for Distinguished Encoding Rules
   82 src/dprintf.c - replacement for OS's that don't have it.
   83 src/elfclass.h - common code for elf 32/64.
   84 src/encoding.c - handles unicode encodings
   85 src/file.c - the main program
   86 src/file.h - header file
   87 src/file_opts.h - list of options
   88 src/fmtcheck.c - replacement for OS's that don't have it.
   89 src/fsmagic.c - first set of tests the program runs, based on filesystem info
   90 src/funcs.c - utilility functions
   91 src/getline.c - replacement for OS's that don't have it.
   92 src/getopt_long.c - replacement for OS's that don't have it.
   93 src/gmtime_r.c - replacement for OS's that don't have it.
   94 src/is_json.c - knows about JavaScript Object Notation format (RFC 8259).
   95 src/is_tar.c, tar.h - knows about Tape ARchive format (courtesy John Gilmore).
   96 src/localtime_r.c - replacement for OS's that don't have it.
   97 src/magic.h.in - source file for magic.h
   98 src/mygetopt.h - replacement for OS's that don't have it.
   99 src/magic.c - the libmagic api
  100 src/names.h - header file for ascmagic.c
  101 src/pread.c - replacement for OS's that don't have it.
  102 src/print.c - print results, errors, warnings.
  103 src/readcdf.c - CDF wrapper.
  104 src/readelf.[ch] - Stand-alone elf parsing code.
  105 src/softmagic.c - 2nd set of tests, based on /etc/magic
  106 src/mygetopt.h - replacement for OS's that don't have it.
  107 src/strcasestr.c - replacement for OS's that don't have it.
  108 src/strlcat.c - replacement for OS's that don't have it.
  109 src/strlcpy.c - replacement for OS's that don't have it.
  110 src/strndup.c - replacement for OS's that don't have it.
  111 src/tar.h - tar file definitions
  112 src/vasprintf.c - for systems that don't have it.
  113 doc/file.man - man page for the command
  114 doc/magic.man - man page for the magic file, courtesy Guy Harris.
  115 	Install as magic.4 on USG and magic.5 on V7 or Berkeley; cf Makefile.
  116 
  117 Magdir - directory of /etc/magic pieces
  118 ------------------------------------------------------------------------------
  119 
  120 If you submit a new magic entry please make sure you read the following
  121 guidelines:
  122 
  123 - Initial match is preferably at least 32 bits long, and is a _unique_ match
  124 - If this is not feasible, use additional check
  125 - Match of <= 16 bits are not accepted
  126 - Delay printing string as much as possible, don't print output too early
  127 - Avoid printf arbitrary byte as string, which can be a source of
  128   crash and buffer overflow
  129 
  130 - Provide complete information with entry:
  131   * One line short summary
  132   * Optional long description
  133   * File extension, if applicable
  134   * Full name and contact method (for discussion when entry has problem)
  135   * Further reference, such as documentation of format
  136 
  137 ------------------------------------------------------------------------------
  138 
  139 gpg for dummies:
  140 
  141 $ gpg --verify file-X.YY.tar.gz.asc file-X.YY.tar.gz
  142 gpg: assuming signed data in `file-X.YY.tar.gz'
  143 gpg: Signature made WWW MMM DD HH:MM:SS YYYY ZZZ using DSA key ID KKKKKKKK
  144 
  145 To download the key:
  146 
  147 $ gpg --keyserver hkp://keys.gnupg.net --recv-keys KKKKKKKK
  148 
  149 ------------------------------------------------------------------------------
  150 
  151 
  152 Parts of this software were developed at SoftQuad Inc., developers
  153 of SGML/HTML/XML publishing software, in Toronto, Canada.
  154 SoftQuad was swallowed up by Corel in 2002 and does not exist any longer.