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From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.questions
Subject: Re: RCS vs. SCCS
Message-ID: <3056@auspex.auspex.com>
Date: 21 Mar 90 01:41:14 GMT
References: <1990Mar15.204111.4923@csmil.umich.edu> <2265@tellab5.tellabs.com>
Organization: Auspex Systems, Santa Clara
Lines: 16

>   SCCS uses forward deltas. This means that when you "check in"
>   a piece of code, the original is stored, and the later copies
>   are really deltas based on the original.

This is not correct.  SCCS does not use forward deltas.  As Mark Runyan
stated in his posting:

  7. RCS stores its revisions so retrieval of the latest revision is quick
     and easy, but early revisions take longer.  SCCS stores revisions so
     that recovering any given revision takes a constant amount of time which
     increases with the number of revisions stored.

>2) SCCS comes standard with BSD and SYS V Unix.

This is also not correct.  SCCS does not come standard with BSD.  The
"sccs" *front end* to SCCS does, but the SCCS code doesn't.