diffmk(1)                                               diffmk(1)



     NAME
          diffmk - mark differences between files

     SYNOPSIS
          diffmk name1 name2 name3

     DESCRIPTION
          diffmk compares two versions of a file and creates a third
          file that includes ``change mark'' commands for nroff(1) or
          troff(1).  name1 and name2 are the old and new versions of
          the file.  diffmk generates name3, which contains the lines
          of name2 plus inserted formatter change mark (.mc) requests.
          When name3 is formatted, changed or inserted text is shown
          by a vertcal bar (|) at the right margin of each line.  The
          position of deleted text is shown by a single asterisk (*).

          If the characters | and * are inappropriate, a copy of
          diffmk can be edited to change them (diffmk is a shell
          procedure).

          If anyone is so inclined, diffmk can be used to produce
          listings of C (or other) programs with changes marked.

     EXAMPLE
          diffmk old.c new.c tmp; nroff macs tmp | pr

          produces a listing of two versions of a C program with
          changes marked.  First the two versions are compared and a
          new file, tmp, is created containing the change mark
          commands.  The temporary file is then passed to nroff(1)
          using the file macs which contains:

               .pl 1
               .ll 77
               .nf
               .eo
               .nc `

          The .ll request might specify a different line length,
          depending on the nature of the program being printed.  The
          .eo and .nc requests are probably needed only for C
          programs.

     FILES
          /usr/bin/diffmk

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

     BUGS
          Aesthetic considerations may dictate manual adjustment of
          some output.  File differences involving only formatting



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     diffmk(1)                                               diffmk(1)



          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.




















































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