noble (1) gdiffmk.1.gz

Name

       gdiffmk - mark differences between groff/nroff/troff files

Synopsis

       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

Description

       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.

Options

       --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.

       -M mark1 mark2
              Change  the  delimiting marks for the -D option.  It makes no sense to use this option without -D.
              Default delimiting marks: “[[” ... “]]”.

       -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 “-”.

Bugs

       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.

Authors

       gdiffmk was written by Mike Bianchi ⟨MBianchi@Foveal.com⟩, now retired.  It is maintained  by  the  groff
       developers.

See also

       groff(1), nroff(1), gtroff(1), roff(7), diff(1)