diffmk(1)						      General Commands Manual							 diffmk(1)

Name
       diffmk - mark differences between files

Syntax
       diffmk name1 name2 name3

Description
       The  command compares two versions of a file and creates a third file that includes ``change mark'' commands for or The name1 and name2 are
       the old and new versions of the file.  The command 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 | at the right margin of each line.  The position of
       deleted text is shown by a single *.

       The command can be used to produce listings of C (or other) programs with changes marked.  A typical command line for such use is the  fol-
       lowing:
       diffmk old.c new.c tmp; nroff macs tmp | pr
       In this example 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 programs.

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

Restrictions
       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.

See Also
       cmp(1), comm(1), diff(1), nroff(1), join(1), sccsdiff(1), troff(1), uniq(1)

																	 diffmk(1)