GDIFFMK(1) General Commands Manual GDIFFMK(1)
NAME
gdiffmk - mark differences between groff/nroff/troff files
SYNOPSIS
gdiffmk [-a addmark] [-c changemark] [-d deletemark] [-D [-B] [-M mark1
mark2]] [-x diffcmd] [--] file1 file2 [output]
gdiffmk --help
gdiffmk --version
DESCRIPTION
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 pack-
ages and all preprocessors. See section “Bugs” below.
OPTIONS
-aaddmark
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.
-cchangemark
Use the changemark for changed source lines. Default: |.
-ddeletemark
Use the deletemark for deleted source lines. Default: *.
-D Show the deleted portions from changed and deleted text. De-
fault delimiting marks: [[ ... ]].
-Mmark1 mark2
Change the delimiting marks for the -D option. It makes no
sense to use this option without -D.
-xdiffcmd
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.
--version
Print version information on the standard output and exit.
BUGS
The output is not necessarily compatible with all macro packages and
all preprocessors. A workaround that is often successful against pre-
processor problems is to run gdiffmk on the output of all the pre-
processors 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.
AUTHORS
gdiffmk was written and is maintained by Mike Bianchi ⟨MBianchi@
Foveal.com⟩.
SEE ALSO
groff(1), nroff(1), gtroff(1), diff(1)
groff 1.22.4 7 March 2023 GDIFFMK(1)
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