Unix source and object control

[VLD/VMB]

Running the "what" command on any file (such as a core dump)
will print out all the SCCS ID strings found therein.  Proper
use of SCCS requires that each SCCS-controlled source code
module generate a string containing this information that will
be linked into the composite executable binary.  E.g.,
$ what /usr/5bin/what
/usr/5bin/what:
	what.c	6.6
	any.c	3.1

When delta'ing the SCCS archives, comments should have been
entered.  I think there is a command to print the comments but
I just look at the beginning of the archive with a text editor.