DIFFMK(CT) XENIX System V DIFFMK(CT)
Name
diffmk - Marks differences between files.
Syntax
diffmk name1 name2 name3
Description
diffmk compares two versions of a file and creates a third
file that includes ``change mark'' commands for nroff(CT) or
troff(CT). 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 ``|'' at the right margin of each line. The
position of deleted text is shown by a single ``*''.
The diffmk command will 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 | pr
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
programs.
If the characters ``|'' and ``*'' are inappropriate, a copy
of diffmk can be edited to change them (diffmk is a shell
procedure).
See Also
diff(C), nroff(CT)
Notes
Aesthetic considerations may dictate manual adjustment of
some output. File differences involving only formatting
requests may produce undesirable output. For example,
replacing .sp by .sp 2 will produce a ``change mark'' on the
preceding or following line of output.
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