] [ -D
] [ -Mmark1 mark2
] [ --
] [ --version
compares two groff
(1), or troff
, and creates an output which is
with added `margin character' (.mc) commands that indicate the
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
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
- Use the addmark for source lines not in file1
but present in file2. Default: +.
- 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
- Use the changemark for changed source lines.
- Use the deletemark for deleted source lines.
- 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.
- Use the diffcmd command to perform the comparison of
file1 and file2. In particular, diffcmd should accept
the GNU diff -Dname option. Default:
- All the following arguments are treated as file names, even
if they begin with -.
- Print a usage message on standard error output and
- Print version information on the standard output and
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.
relies on the -Dname
option of GNU diff
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
Report bugs to
Include a complete, self-contained example that will allow the bug to be
reproduced, and say which version of gdiffmk
you are using.
Copyright © 2004-2014 Free Software Foundation, Inc.
This file is part of the gdiffmk utility, which is part of groff, a free
You can redistribute and/or modify gdiffmk 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; 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
this program. If not, see <http://www.gnu.org/licenses/>.
This document was written and is maintained by