gdiffmk compares two roff(7) documents, file1 and file2, and
creates a roff document consisting of file2 with added margin
character (.mc) requests indicating output lines that differ from
file1. If the file1 or file2 argument is “-”, gdiffmk reads the
standard input stream for that input. If the output operand is
present, gdiffmk writes output to a file of that name. If it is
“-” or absent, gdiffmk writes output to the standard output
stream. “-” cannot be both an input and output operand.
--help displays a usage message and --version shows version
information; both exit afterward.
Use add-mark 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 roff break request, .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 change-mark for changed source lines. Default: “|”.
Use the delete-mark for deleted source lines. Default:
-D Show the deleted portions from changed and deleted text.
-M mark1 mark2
Change the delimiting marks for the -D option. It makes
no sense to use this option without -D. Default
delimiting marks: “[[” ... “]]”.
Use the diff-command command to perform the comparison of
file1 and file2. In particular, diff-command should
accept the GNU diff(1) -D option. Default: diff.
-- Treat all subsequent arguments as file names, even if they
begin with “-”.
The output is not necessarily compatible with all macro packages
and all preprocessors. A workaround that often overcomes
preprocessor problems is to run gdiffmk on the output of all the
preprocessors instead of the input source.
gdiffmk relies on the -D option of GNU diff to make a merged
“#ifdef” output format. Busybox diff is known to not support it.
Also see the -x diff-command option.
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 project's upstream Git repository
⟨https://git.savannah.gnu.org/git/groff.git⟩ on 2023-06-23. (At
that time, the date of the most recent commit that was found in
the repository was 2023-06-23.) 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 1.23.0.rc4.250-1b2b6-dirt2y2 June 2023 gdiffmk(1)