1 CVS is a version control system, which allows you to keep old versions 2 of files (usually source code), keep a log of who, when, and why changes 3 occurred, etc., like RCS or SCCS. Unlike the simpler systems, CVS 4 does not just operate on one file at a time or one directory at a time, 5 but operates on hierarchical collections of directories consisting of 6 version controlled files. CVS helps to manage releases and to control 7 the concurrent editing of source files among multiple authors. CVS 8 allows triggers to enable/log/control various operations and works well 9 over a wide area network (see man pages). 10