|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
Name | Synopsis | Description | Options | Exit status | Caveats | Authors | See also | COLOPHON |
|
|
|
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-file]
gdiffmk --help
gdiffmk --version
gdiffmk compares two roff(7) documents, file1 and file2, and
writes another, derived from both, to the standard output stream
(or output-file), adding margin character (mc) requests at places
in the output where the input documents differ. gdiffmk does not
interpret the source documents; it treats roff comments and
nilpotent changes to formatting as meaningful. For example, it
does not know that \h'3m', \h'(1 * 3m)', and \h'3m+0' all mean the
same thing. 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.
-a add-mark
Annotate material absent from file1 but present in file2
with add-mark (default: “+”).
-B Suppress br requests normally inserted by -D option. Use
with caution; such requests are the only way to guarantee
that deletions and small changes are marked.
-c change-mark
Annotate material differing between file1 and file2 with
change-mark (default: “|”).
-d delete-mark
Annotate material present in file1 but absent from file2
with delete-mark (default: “*”).
-D Mark changed and deleted material with surrounding
delimiters.
-M mark1 mark2
Use mark1 (default: “[[”) and mark2 (default: “]]”) as
delimiters when using the -D option.
-x diff-command
Use the diff-command program to perform the comparison of
file1 and file2. diff-command (default: diff) must accept
GNU diff(1)'s -D extension option.
-- Treat all subsequent arguments as file names, even if they
begin with “-”.
gdiffmk exits with status 0 if the input files are the same; 1 if
they differ; 2 upon a usage error; 3 if the system's diff(1) or
sh(1) commands do not support features gdiffmk requires; and 4 if
the output argument is a duplicate of file1 or file2.
The output is not necessarily compatible with all macro packages
or preprocessors. A reliable workaround is to run gdiffmk on the
output of the final preprocessor 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.
gdiffmk was written by Mike Bianchi ⟨[email protected]⟩, now
retired. It is maintained by the groff developers.
groff(1), nroff(1), troff(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 2025-08-11. (At
that time, the date of the most recent commit that was found in
the repository was 2025-08-09.) 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 protected]
groff 1.23.0.3821-a8b3f 2025-08-09 gdiffmk(1)
|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|