diffmk(1M)                                                       diffmk(1M)

NAME
     diffmk - mark differences between versions of an input file

SYNOPSIS
     diffmk oldfile newfile markedfile

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

     diffmk can also be used in conjunction with the proper nroff/troff
     requests to produce program listings with marked changes. In the fol-
     lowing command line:

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

     the file reqs contains the requests

          .pl 1
          .ll 77
          .nf
          .eo

     which eliminate page breaks (.pl), adjust the line length (.ll), set
     no-fill mode and turn off hyphenation (.nf), and ignore escape charac-
     ters (.eo), respectively.

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

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

     The command /usr/bin/diffmk is identical to the UCB version
     /usr/ucb/diffmk.

SEE ALSO
     diff(1), nroff(1M), troff(1M).








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