This article is from the Configuration Management Tools FAQ, by Dave Eaton dwe@arde.com with numerous contributions by others.
BCS stands for Baseline Configuration System. It was written by Jay
Berkenbilt (ejb@ql.org) and runs on UNIX only. Like CVS, BCS attempts
to add concurrency to an existing version control system, but it does
so with a different approach. The primary function of BCS is to
maintain a stable "baseline" controlled under RCS or SCCS and multiple
"staging areas" that are mirrors of the baseline (implemented as
symbolic link trees).
BCS is no longer being actively enhanced or maintained. The last
released version was 2.0.2. Version 3.0 alpha 6, from late 1995, is a
stable snapshot version that implements some of the changes specified
for version 3.0. No further releases are expected. Please email the
author (ejb@ql.org) for further information.
 
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