RCS vs SCCS: What are the keywords?
RCS and SCCS use different keywords that are expanded in thetext. For SCCS the keyword "%I%" is replaced with the revision
number if the file is checked out for reading.
The RCS keywords are easier to remember, but keyword expansion is
more easily customized in SCCS.
In SCCS, keywords are expanded on a read-only get. If a version
with expanded keywords is copied into a file that will be
deltaed, the keywords will be lost and the version information in
the file will not be updated. On the other hand, RCS retains the
keywords when they are expanded so this is avoided.
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