gdiffmk(1) General Commands Manual gdiffmk(1)
gdiffmk - mark differences between groff/nroff/troff files
gdiffmk [-a add-mark] [-c change-mark] [-d delete-mark] [-x diff- command] [-D [-B] [-M mark1 mark2]] [--] file1 file2 [output] gdiffmk --help gdiffmk --version
gdiffmk compares two roff(7) documents, file1 and file2, and creates an output which is file2 with added margin character (.mc) requests that indicate the lines with differences. If the file1 or file2 argument is “-”, the standard input stream is read for that input. If the output filename is present, the output is written there. If it is “-” or absent, the output is written to the standard output stream. “-” cannot be both input and output.
--help displays a usage message and --version shows version information; both exit afterward. -a add-mark 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. -c change-mark Use change-mark for changed source lines. Default: “|”. -d delete-mark Use the delete-mark for deleted source lines. Default: “*”. -D Show the deleted portions from changed and deleted text. Default delimiting marks: “[[” ... “]]”. -M mark1 mark2 Change the delimiting marks for the -D option. It makes no sense to use this option without -D. -x diff-command 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. It hasn't been tested whether other versions of diff support this option. Also see the -x diff- command option.
gdiffmk was written and is maintained by Mike Bianchi ⟨MBianchi@ Foveal.com⟩.
groff(1), nroff(1), gtroff(1), roff(7), diff(1)
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 2021-06-20. (At that time, the date of the most recent commit that was found in the repository was 2021-06-17.) 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 email@example.com groff 1.23.0.rc1.56-5346-dirt1y3 November 2020 gdiffmk(1)
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