Subversion is a version control system, which allows you to keep old
versions of files and directories (usually source code), keep a log of
who, when, and why changes occurred, etc., like CVS, RCS or SCCS.
Subversion keeps a single copy of the master sources. This copy
is called the source ``repository''; it contains all the information
to permit extracting previous versions of those files at any time.
Documentation for Subversion and its tools, including detailed usage
explanations of the svn, svnadmin, svnserve and
svnlook programs, historical background, philosophical
approaches and reasonings, etc., can be found at
http://svnbook.red-bean.com/.
Run `svnsync help' to access the built-in tool documentation.