[ 源代码： rcs ]
软件包：rcs（5.10.1-1 以及其他的）
The GNU Revision Control System
The Revision Control System (RCS) manages multiple revisions of files. RCS automates the storing, retrieval, logging, identification, and merging of revisions. RCS is useful for text that is revised frequently, for example programs, documentation, graphics, papers, and form letters.
Note: this package contains certain general-purpose commands (such as merge or ident) which may used by other programs installed on your system.