This article is from the Configuration Management Tools FAQ, by Dave Eaton dwe@arde.com with numerous contributions by others.
PRCS, the Project Revision Control System is the front end to a set of
tools that deal with sets of files and directories as an entity,
preserving coherent versions of the entire set.
PRCS was designed primarily by Professor P. N. Hilfinger, with input
and modifications by Luigi Semenzato and Josh MacDonald. PRCS is
written and maintained by Josh MacDonald.
Its purpose is similar to that of SCCS, RCS, and CVS, but (according
to its authors, at least), it is much simpler than any of those
systems.
PRCS can be found at ftp://XCF.Berkeley.EDU/pub/. HTML
documentation and recent developments are available online at
http://www.xcf.berkeley.edu/~jmacd/prcs.html.
PRCS is released under the GNU public license.
 
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