Are there any Change Management Systems (CMS) for Linux?

<p>I am curious to find out if there are any Change Management Systems available for Linux (free of course). I'd like to be able to make changes to common files I use but have the ability to "backout" those changes (version control). I have written some various shell scripts that do this in a very simple manner (cp existing file -> append date -> place in a different directory -> diff old/new and save that output) and perhaps that's enough but was hoping folks on here would know of same actual CMS tools out there.</p> <p>Thanks - Andy</p>