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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  cre-
       ates  an  output 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  pre-
       processors.  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  particu-
	      lar, 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 for-
       mat.  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 Public License (GPL), while the documentation  files  mostly  use
       the GNU Free Documentation License (FDL).

COPYRIGHT
       Copyright (C) 2004, 2005, 2008 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	3
       of the License, or (at your option) any later version.

       gdiffmk is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; with-
       out 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 this program.
       If not, see <http://www.gnu.org/licenses/>.

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

Groff Version 1.22.2			 7 February 2013			       GDIFFMK(1)
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