diffmk(1BSD)         (BSD System Compatibility)         diffmk(1BSD)


       NAME
             diffmk - (BSD) 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 markedfile, which,
             contains the text from newfile with troff(1BSD) ``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 hyphenation,
             respectively.

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

       REFERENCES
             diff(1), nroff(1BSD), sed(1), troff(1BSD)

       NOTICES
             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.


                           Copyright 1994 Novell, Inc.               Page 1