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 ⟨firstname.lastname@example.org⟩. Include a complete, self-con‐
tained example that will allow the bug to be reproduced, and say
which version of gdiffmk you are using.
This page is part of the groff (GNU troff) project. Information
about the project can be found at
⟨http://www.gnu.org/software/groff/⟩. If you have a bug report for
this manual page, see ⟨http://www.gnu.org/software/groff/⟩. This
page was obtained from the tarball groff-1.22.3.tar.gz fetched from
⟨ftp://ftp.gnu.org/gnu/groff/⟩ on 2016-08-07. If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
Groff Version 1.22.3 4 November 2014 GDIFFMK(1)