diffmk - mark differences between versions of a troff input
diffmk oldfile newfile markedfile
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 *.
See largefile(5) for the description of the behavior of
diffmk when encountering files greater than or equal to 2
Gbyte ( 2**31 bytes).
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:
which eliminate page breaks, adjust the line length, set
no-fill mode, ignore escape characters, and turn off hyphe-
If the characters | and * are inappropriate, you might run
markedfile through sed(1) to globally change them.
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWdoc |
diff(1), nroff(1), sed(1), troff(1), attributes(5), large-
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.
Man(1) output converted with