diffmk(1) User Commands diffmk(1)
diffmk - mark differences between versions of a troff input file
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). old-
file and newfile are the old and new versions of the file. diffmk gen-
erates markedfile, which, contains the text from newfile with troff(1)
"change mark" requests (.mc) inserted where newfile differs from old-
file. 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 com-
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 hyphenation, respectively.
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 attributes:
tab() allbox; cw(2.750000i)| cw(2.750000i) lw(2.750000i)|
lw(2.750000i). ATTRIBUTE TYPEATTRIBUTE VALUE AvailabilitySUNWdoc
diff(1), nroff(1), sed(1), troff(1), attributes(5), largefile(5)
Aesthetic considerations may dictate manual adjustment of some output.
File differences involving only formatting requests may produce unde-
sirable output, that is, replacing .sp by .sp 2 will produce a "change
mark" on the preceding or following line of output.
SunOS 5.10 14 Sep 1992 diffmk(1)