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GDIFFMK(1)                                                                                        GDIFFMK(1)



NAME
       gdiffmk - mark differences between groff/nroff/troff files

SYNOPSIS
       gdiffmk [ -aaddmark ] [ -cchangemark ] [ -ddeletemark ] [ -D [ -B ] [ -Mmark1 mark2 ] ] [ -xdiffcmd ]
               [ -- ] [ --help ] [ --version ] file1 file2 [ output ]

DESCRIPTION
       gdiffmk compares two groff(1), nroff(1), or troff(1) documents, file1 and file2, and creates an  out-put output
       put which is file2 with added `margin character' (.mc) commands that indicate the differences.

       If  the  output filename is present, the output is written there.  If it is - or absent the output is
       written to the standard output.

       If the file1 or file2 argument is - the standard input is read for that input.  Clearly  both  cannot
       be -.

       Note  that  the  output  is not necessarily compatible with all macro packages and all preprocessors.
       See the BUGS section below.

OPTIONS
       -aaddmark
              Use the addmark for source lines not in file1 but present in file2.  Default: +.

       -B     By default, the deleted texts marked by the -D option end with an added troff  break  command,
              .br, to ensure that the deletions are marked properly.  This is the only way to guarantee that
              deletions and small changes get flagged.  This option directs the program not to insert  these
              breaks; it makes no sense to use it without -D.

       -cchangemark
              Use the changemark for changed source lines.  Default: |.

       -ddeletemark
              Use the deletemark for deleted source lines.  Default: *.

       -D     Show  the  deleted  portions from changed and deleted text.  Default delimiting marks: [[ ....
              ]].

       -Mmark1 mark2
              Change the delimiting marks for the -D option.  It makes no sense to use this  option  without
              -D.

       -xdiffcmd
              Use  the diffcmd command to perform the comparison of file1 and file2.  In particular, diffcmd
              should accept the GNU diff -Dname option.  Default: diff(1).

       --     All the following arguments are treated as file names, even if they begin with -.

       --help Print a usage message on standard error output and exit.

       --version
              Print version information on the standard output and exit.

BUGS
       The output is not necessarily compatible with all macro packages and all preprocessors.  A workaround
       that  is  often  successful  against preprocessor problems is to run gdiffmk on the output of all the
       preprocessors instead of the input source.

       gdiffmk relies on the -Dname option of GNU diff(1) to make  a  merged  `#ifdef'  output  format.   It
       hasn't  been tested whether other versions of diff(1) do support this option.  See also the -xdiffcmd
       option.

       Report bugs to bug-groff@gnu.org.  Include a complete, self-contained example that will allow the bug
       to be reproduced, and say which version of gdiffmk you are using.

AUTHORS
       This document was written and is maintained by

       Mike Bianchi <MBianchi@Foveal.com>.

       This  document is distributed under the terms of the FDL (GNU Free Documentation License) version 1.1
       or later.  You should have received a copy of the FDL on your system, it is also available on-line at
       the GNU copyleft site <http://www.gnu.org/copyleft/fdl.html.

       gdiffmk is part of the groff GNU free software project.  All parts of the groff package are protected
       by GNU copyleft licenses.  The software files are distributed under the terms of the GNU General Pub-lic Public
       lic License (GPL), while the documentation files mostly use the GNU Free Documentation License (FDL).

COPYRIGHT
       Copyright (C) 2004, 2005 Free Software Foundation, Inc.

       gdiffmk is free software; you can redistribute it and/or modify it under the terms of the GNU General
       Public  License  as  published by the Free Software Foundation; either version 2, or (at your option)
       any later version.

       gdiffmk is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
       implied  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
       License for more details.

       You should have received a copy of the GNU General Public License along  with  groff;  see  the  file
       COPYING.   If  not,  write  to the Free Software Foundation, 51 Franklin St - Fifth Floor, Boston, MA
       02110-1301, USA.

SEE ALSO
       groff(1), nroff(1), gtroff(1), diff(1)



Groff Version 1.19.2                             26 May 2005                                      GDIFFMK(1)