AT&T UNIX™PC Unix System V Users Manual - tenox

DIFFMK(l) DIFFMK( l)
NAME
diffmk - mark differences between files
SYNOPSIS
diffmk [ - - ] filet file2 file3
DESCRIPTION
diffmk compares two versions of a file and creates a third file that
includes "change mark" requests (.me) for nroff( l) or troff filel and
file2 are the old and new versions of the file. diffmk generates file3 ,
which contains the lines of file2 plus inserted formatter "change mark"
requests. When file3 is formatted, changed or inserted text is shown by
I at the right margin of each line. The position of deleted text is shown
by a single asterisk: *·
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
ditTmk old.c new.c tmp; nroff macs tmp I pr
where the file macs contains
.pl 1
.11 77
.nf
.eo
.ec ,
The .ll request might specify a different line length, depending on the
nature of the program being printed. The .eo and .ec requests are probably
needed only for C programs.
SEE ALSO
man(l), mm(l), and nroff(l).
BUGS
Where diffmk encounters - it uses the standard input.
Aesthetic considerations may dictate manual adjustment of some output.
File differences involving only formatting requests may produce undesir -
able 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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