diffmk(1)                                               diffmk(1)



     NAME
          diffmk - mark differences between files

     SYNOPSIS
          diffmk [-] file1 file2 file3

     DESCRIPTION
          diffmk compares two versions of a file and creates a third
          file that includes ``change mark'' requests (.mc) for
          nroff(1) or troff(1).  The placeholders file1 and file2 are
          the old and new versions of the file.  If - is given, file1
          is read from standard input.  diffmk generates file3, which
          contains the lines of file2 plus inserted formatter ``change
          mark'' requests.  When file3 is formatted, changed or in-
          serted text is shown by | at the right margin of each line.
          The position of deleted text is shown by *, a single aster-
          isk.

          If anyone is so inclined, diffmk can be used to produce
          listings of C (or other) programs with changes marked.  A
          typical command line for such use is

             diffmk old.c new.c tmp; nroff macs tmp | lp

          where the file macs 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 pro-
          grams.

     FILES
          /usr/bin/diffmk

     SEE ALSO
          bdiff(1), cmp(1), diff(1), diff3(1), nroff(1), troff(1).

     BUGS
          Aesthetic considerations may dictate manual adjustment of
          some output.  File differences involving only formatting re-
          quests may produce undesirable output. For example, replac-
          ing .sp by .sp 2 produces a ``change mark'' on the preceding
          or following line of output.






     April, 1990                                                     1