RCS
From Knowledge Base
RCS or the Revision Control System is a primitive version control system for tracking the change history of a single file over time. Because it only works on single files it is not all that useful for working on software projects which normally consist of collections of many files; CVS was developed out of RCS with a view to overcoming this limitation.
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See also
- Wikipedia article on RCS: http://en.wikipedia.org/wiki/Revision_Control_System
