Although there are several valid command-line options for
they are not frequently used; the most common usage of delta is
and this command simply applies the changes to the file umsp.c to
the sccs file which tracks it. Though it is possible to specify
the comment and MR-number for this change using command-line options,
it's more common to type them when prompted, unless
being driven by another program; either way, it's unusual to specify
delta on the command line.
Note that the filename you specify on the command line is that of the
sccs file, not the filename of the working file. The BSD wrapper
program, sccs(1), will guess the correct filename for you, but this
doesn't happen unless you do actually invoke it (
umsp.c for example).