DIFFMK(1) User Commands DIFFMK(1)
NAME
diffmk - mark differences between versions of a troff input file
SYNOPSIS
diffmk oldfile newfile markedfileDESCRIPTION
diffmk compares two versions of a file and creates a third version
that includes "change mark" (
.mc) commands for
nroff(1) and
troff(1).
oldfile and
newfile are the old and new versions of the file.
diffmk generates
markedfile, which, contains the text from
newfile with
troff(1) "change mark" requests (
.mc) inserted where
newfile differs
from
oldfile. When
markedfile 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
*.
USAGE
See
largefile(7) for the description of the behavior of
diffmk when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
EXAMPLES
Example 1: An example of the diffmk command.
diffmk can also be used in conjunction with the proper
troff requests to produce program listings with marked changes. In the
following command line:
example% diffmk old.c new.c marked.c ; nroff reqs marked.c | pr the file
reqs contains the following
troff requests:
.pl 1
.ll 77
.nf
.eo
.nh
which eliminate page breaks, adjust the line length, set no-fill
mode, ignore escape characters, and turn off hyphenation,
respectively.
If the characters
| and
* are inappropriate, you might run
markedfile through
sed(1) to globally change them.
SEE ALSO
diff(1),
nroff(1),
sed(1),
troff(1),
attributes(7),
largefile(7)BUGS
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.
September 14, 1992 DIFFMK(1)
