SCCS (Source Code Control System) was developed in 1972 and predated RCS as the dominant version control system for Unix. https://en.wikipedia.org/wiki/Source_

SCCS (Source Code Control System) was developed in 1972 and predated RCS as the dominant version control system for Unix. https://en.wikipedia.org/wiki/Source_Code_Control_System https://en.wikipedia.org/wiki/Source_Code_Control_System Version control is not a new concept and was in widespread use in the 1980's. :-)