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GDIFFMK(1)		    General Commands Manual		    GDIFFMK(1)

       gdiffmk - mark differences between groff/nroff/troff files

       gdiffmk [-a addmark] [-c	changemark] [-d	deletemark] [-D	[-B] [-M mark1
	       mark2]] [-x diffcmd] [--] file1 file2 [output]

       gdiffmk --help

       gdiffmk --version

       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.

	      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.  De-
	      fault 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 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.

       gdiffmk	was  written  and  is  maintained  by  Mike Bianchi <MBianchi@>.

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

groff 1.22.4		       17 December 2018			    GDIFFMK(1)


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