Please read more about that here . BitKeeper is the higher level system, BitSCCS is the underpinnings. Sdiffs does side by side diffs and diffs does regular, context, or unified diff format. Clean can also be instructed to remove all changed working files, discarding any work in progress. Sccslog sorts the changes by time across all files, which is a much more intuitive way to view the data.
Symbols are revision controlled just like file contents.
In addition, BitSCCS can be instructed to expand keywords using 4 digit years instead of the tradition 2 digits. Range processing - BitSCCS commands support the use of ranges for specifying a revision or set of revisions. Time zones, pathnames, hostnames are recorded. ATT SCCS did not record this information. Pathnames are revision controlled just like file contents.