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OpenSolaris 2009.06 - man page for diffmk (opensolaris section 1)

diffmk(1)				  User Commands 				diffmk(1)

NAME
       diffmk - mark differences between versions of a troff input file

SYNOPSIS
       diffmk oldfile newfile markedfile

DESCRIPTION
       diffmk  compares  two versions of a file and creates a third version that includes "change
       mark" (.mc) commands for nroff(1) and  troff(1). oldfile and newfile are the old  and  new
       versions  of  the file. diffmk generates markedfile, which, contains the text from newfile
       with  troff(1) "change mark" requests (.mc) inserted where  newfile differs from  oldfile.
       When  markedfile is formatted, changed or inserted text is shown by  | at the right margin
       of each line. The position of deleted text is shown by a single *.

USAGE
       See largefile(5) for the description of the behavior of	diffmk	when  encountering  files
       greater than or equal to 2 Gbyte ( 2^31 bytes).

EXAMPLES
       Example 1 An example of the diffmk command.

       diffmk  can also be used in conjunction with the proper	troff requests to produce program
       listings with marked changes. In the following command line:

	 example% diffmk old.c new.c marked.c ; nroff reqs marked.c | pr

       the file reqs contains the following troff requests:

	 .pl 1
	 .ll 77
	 .nf
	 .eo
	 .nh

       which eliminate page breaks, adjust the line length, set no-fill mode, ignore escape char-
       acters, and turn off hyphenation, respectively.

       If the characters  | and * are inappropriate, you might run  markedfile through	sed(1) to
       globally change them.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWdoc			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       diff(1), nroff(1), sed(1), troff(1), attributes(5), largefile(5)

BUGS
       Aesthetic considerations may dictate manual adjustment of some  output.	File  differences
       involving  only formatting requests may produce undesirable output, that is, replacing .sp
       by .sp 2 will produce a "change mark" on the preceding or following line of output.

SunOS 5.11				   14 Sep 1992					diffmk(1)


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