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- .SH
- Functions of RCS (Revision Control System)
- .PP
- RCS manages software libraries. It greatly increases programmer productivity
- by providing the following functions.
- .IP 1.
- RCS stores and retrieves multiple revisions of program and other text.
- Thus, one can maintain one or more releases while developing the next
- release, with a minimum of space overhead. Changes no longer destroy the
- original -- previous revisions remain accessible.
- .RS
- .IP a.
- Maintains each module as a tree of revisions.
- .IP b.
- Project libraries can
- be organized centrally, decentralized, or any way you like.
- .IP c.
- RCS works for any type of text: programs, documentation, memos, papers,
- graphics, VLSI layouts, form letters, etc.
- .RE
- .IP 2.
- RCS maintains a complete history of changes.
- Thus, one can find out what happened to a module easily
- and quickly, without having to compare source listings or
- having to track down colleagues.
- .RS
- .IP a.
- RCS performs automatic record keeping.
- .IP b.
- RCS logs all changes automatically.
- .IP c.
- RCS guarantees project continuity.
- .RE
- .IP 3.
- RCS manages multiple lines of development.
- .IP 4.
- RCS can merge multiple lines of development.
- Thus, when several parallel lines of development must be consolidated
- into one line, the merging of changes is automatic.
- .IP 5.
- RCS flags coding conflicts.
- If two or more lines of development modify the same section of code,
- RCS can alert programmers about overlapping changes.
- .IP 6.
- RCS resolves access conflicts.
- When two or more programmers wish to modify the same revision,
- RCS alerts the programmers and makes sure that one modification won't wipe
- out the other one.
- .IP 7.
- RCS provides high-level retrieval functions.
- Revisions can be retrieved according to ranges of revision numbers,
- symbolic names, dates, authors, and states.
- .IP 8.
- RCS provides release and configuration control.
- Revisions can be marked as released, stable, experimental, etc.
- Configurations of modules can be described simply and directly.
- .IP 9.
- RCS performs automatic identification of modules with name, revision
- number, creation time, author, etc.
- Thus, it is always possible to determine which revisions of which
- modules make up a given configuration.
- .IP 10.
- Provides high-level management visibility.
- Thus, it is easy to track the status of a software project.
- .RS
- .IP a.
- RCS provides a complete change history.
- .IP b.
- RCS records who did what when to which revision of which module.
- .RE
- .IP 11.
- RCS is fully compatible with existing software development tools.
- RCS is unobtrusive -- its interface to the file system is such that
- all your existing software tools can be used as before.
- .IP 12.
- RCS' basic user interface is extremely simple. The novice need to learn
- only two commands. Its more sophisticated features have been
- tuned towards advanced software development environments and the
- experienced software professional.
- .IP 13.
- RCS simplifies software distribution if customers
- maintain sources with RCS also. This technique assures proper
- identification of versions and configurations, and tracking of customer
- modifications. Customer modifications can be merged into distributed
- versions locally or by the development group.
- .IP 14.
- RCS needs little extra space for the revisions (only the differences).
- If intermediate revisions are deleted, the corresponding
- differences are compressed into the shortest possible form.
- .IP 15.
- RCS is implemented with reverse deltas. This means that
- the latest revision, which is the one that is accessed most often,
- is stored intact. All others are regenerated from the latest one
- by applying reverse deltas (backward differences). This
- results in fast access time for the revision needed most often.
-