From: Bill Wohler
RCS allows you treat a set of files as a family of files while
SCCS is meant primarily for keeping the revision history of
files.
RCS accomplishes that with symbolic names: you can mark all the
source files associated with an application version with `rcs
-n', and then easily retrieve them later as a cohesive unit. In
SCCS you would have to do this by writing a script to write or
read all file names and versions to or from a file.