gdiffmk - mark differences between groff/nroff/troff files
gdiffmk [ -aaddmark ] [ -cchangemark ] [ -ddeletemark ] [ -D [ -B ] [ -Mmark1 mark2 ] ]
[ -xdiffcmd ] [ -- ] [ --help ] [ --version ] file1 file2 [ output ]
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
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.
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.
Use the changemark for changed source lines. Default: |.
Use the deletemark for deleted source lines. Default: *.
-D Show the deleted portions from changed and deleted text. Default delimiting marks:
[[ .... ]].
Change the delimiting marks for the -D option. It makes no sense to use this
option without -D.
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.
Print version information on the standard output and exit.
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 email@example.com. Include a complete, self-contained example that will
allow the bug to be reproduced, and say which version of gdiffmk you are using.
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 (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; 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 groff; see
the file COPYING. If not, write to the Free Software Foundation, 51 Franklin St - Fifth
Floor, Boston, MA 02110-1301, USA.
groff(1), nroff(1), gtroff(1), diff(1)
Groff Version 1.19.2 February 6, 2006 GDIFFMK(1)