diffmk(1)                USER COMMANDS                  diffmk(1)



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

SYNOPSIS
     /usr/ucb/diffmk oldfile newfile markedfile

DESCRIPTION
     The diffmk command compares  two  versions  of  a  file  and
     creates  a third version that includes ``change mark'' (.mc)
     commands for nroff and troff.  oldfile and newfile  are  the
     old  and new versions of the file.  diffmk generates marked-
     file, 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 a | at the right margin of each
     line.  The position of deleted text is shown by a single  *.
     diffmk can also be used in conjunction with the proper troff
     requests to produce program listings  with  marked  changes.
     In the following command line:

          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 characters, and turn off hyphe-
     nation, respectively.  If the characters | and *  are  inap-
     propriate,  you might run markedfile through sed to globally
     change them.

SEE ALSO
     nroff(1), troff(1) diff(1), sed(1) in the  User's  Reference
     Manual.

NOTES
     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.











             Last change: BSD Compatibility Package             1