A Revision Control Formulas (RCS) is an implementation of such a body which automates the storing, retrieval, logging, identification, & merging of revisions. RCS is utile for text that is revised oftentimes, for instance programs, documentation, procedural graphics, papers, and form letters. RCS is as well capable of treating binary files, though by having decreased efficiency & efficaciousness. Revisions come stored using a help of the Diff utility.

RCS was at first developed by Walter F. Tichy while he was at Purdue University. These are okay, section of the GNU project, but is however maintained by Purdue University.

Because it operates just in lone files, has there is no way of working using an entire design, nor allows multiple users to act in the file at the same time, it has been superseded by CVS and other packages capable of supporting complex projects. CVS was originally build on RCS.

RCS is utilized by TWiki.