1GDIFFMK(1)                  General Commands Manual                 GDIFFMK(1)
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NAME

6       gdiffmk - mark differences between groff/nroff/troff files
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SYNOPSIS

9       gdiffmk [-a addmark] [-c changemark] [-d deletemark] [-D [-B] [-M mark1
10               mark2]] [-x diffcmd] [--] file1 file2 [output]
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12       gdiffmk --help
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14       gdiffmk --version
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DESCRIPTION

17       gdiffmk compares two groff(1), nroff(1), or troff(1)  documents,  file1
18       and  file2,  and  creates  an  output which is file2 with added “margin
19       character” (.mc) commands that indicate the differences.
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21       If the output filename is present, the output is written there.  If  it
22       is - or absent the output is written to the standard output.
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24       If the file1 or file2 argument is - the standard input is read for that
25       input.  Clearly both cannot be -.
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27       Note that the output is not necessarily compatible with all macro pack‐
28       ages and all preprocessors.  See section “Bugs” below.
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OPTIONS

31       -aaddmark
32              Use  the  addmark  for  source lines not in file1 but present in
33              file2.  Default: +.
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35       -B     By default, the deleted texts marked by the -D option  end  with
36              an  added troff break command, .br, to ensure that the deletions
37              are marked properly.  This is the only  way  to  guarantee  that
38              deletions  and  small  changes get flagged.  This option directs
39              the program not to insert these breaks; it makes no sense to use
40              it without -D.
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42       -cchangemark
43              Use the changemark for changed source lines.  Default: |.
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45       -ddeletemark
46              Use the deletemark for deleted source lines.  Default: *.
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48       -D     Show  the  deleted  portions from changed and deleted text.  De‐
49              fault delimiting marks: [[ ... ]].
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51       -Mmark1 mark2
52              Change the delimiting marks for the  -D  option.   It  makes  no
53              sense to use this option without -D.
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55       -xdiffcmd
56              Use  the  diffcmd command to perform the comparison of file1 and
57              file2.  In particular, diffcmd should accept the GNU diff -Dname
58              option.  Default: diff(1).
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60       --     All  the  following arguments are treated as file names, even if
61              they begin with -.
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63       --help Print a usage message on standard error output and exit.
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65       --version
66              Print version information on the standard output and exit.
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BUGS

69       The output is not necessarily compatible with all  macro  packages  and
70       all  preprocessors.  A workaround that is often successful against pre‐
71       processor problems is to run gdiffmk on the  output  of  all  the  pre‐
72       processors instead of the input source.
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74       gdiffmk  relies  on  the  -Dname option of GNU diff(1) to make a merged
75       “#ifdef” output format.  It hasn't been tested whether  other  versions
76       of diff(1) do support this option.  See also the -xdiffcmd option.
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AUTHORS

79       gdiffmk  was  written  and  is  maintained  by  Mike Bianchi ⟨MBianchi@
80       Foveal.com⟩.
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SEE ALSO

83       groff(1), nroff(1), gtroff(1), diff(1)
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87groff 1.22.4                     22 July 2021                       GDIFFMK(1)
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