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       gdiffmk - mark differences between groff/nroff/troff files


       gdiffmk [ -aaddmark ] [ -cchangemark ] [ -ddeletemark ] [ -D [ -B ]
               [ -Mmark1 mark2 ] ] [ -xdiffcmd ] [ -- ] [ --help ]
               [ --version ] file1 file2 [ output ]


       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
       packages and all preprocessors.  See the BUGS section below.


              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.

              Use the changemark for changed source lines.  Default: |.

              Use the deletemark for deleted source lines.  Default: *.

       -D     Show  the  deleted  portions  from  changed  and  deleted  text.
              Default delimiting marks: [[ .... ]].

       -Mmark1 mark2
              Change  the  delimiting  marks  for  the -D option.  It makes no
              sense to use this option without -D.

              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.

              Print version information on the standard output and exit.


       The  output  is  not necessarily compatible with all macro packages and
       all preprocessors.  A  workaround  that  is  often  successful  against
       preprocessor  problems  is  to  run  gdiffmk  on  the output of all the
       preprocessors 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.

       Report bugs to  Include a  complete,  self-contained
       example that will allow the bug to be reproduced, and say which version
       of gdiffmk you are using.


       This document was written and is maintained by Mike Bianchi

       This document is distributed under the  terms  of  the  FDL  (GNU  Free
       Documentation  License) version 1.1 or later.  You should have received
       a copy of the FDL on your system, it is also available on-line  at  the
       GNU copyleft site

       gdiffmk  is  part of the groff GNU free software project.  All parts of
       the groff package are protected by GNU copyleft licenses.  The software
       files are distributed under the terms of the GNU General Public License
       (GPL),  while  the  documentation  files  mostly  use  the   GNU   Free
       Documentation License (FDL).


       Copyright © 2004, 2005, 2008 Free Software Foundation, Inc.

       gdiffmk  is  free  software;  you  can redistribute it and/or modify it
       under the terms of the GNU General Public License as published  by  the
       Free  Software Foundation, either version 3 of the License, or (at your
       option) any later version.

       gdiffmk is distributed in the hope that it will be useful, but  WITHOUT
       ANY  WARRANTY;  without even the implied warranty of MERCHANTABILITY or
       FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General  Public  License
       for more details.

       You should have received a copy of the GNU General Public License along
       with this program. If not, see <>.


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