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 creates 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 preprocessors. 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 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.
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 format. 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
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
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 © 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; 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/>.
groff(1), nroff(1), gtroff(1), diff(1)