Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!uunet!auspex!guy
From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.questions
Subject: Re: AT&T "nth Edition" vs. "Release n"
Message-ID: <6436@auspex.auspex.com>
Date: 5 Mar 91 19:13:29 GMT
References: <6798@idunno.Princeton.EDU> <15939.27d2ddef@levels.sait.edu.au>
Organization: Auspex Systems, Santa Clara
Lines: 19

>System V derives from System III which derives from 6th edition (or there
>abouts).

No.  System III derives from UNIX/TS 1.0 or some such thing (I *think*
PWB/UNIX 2.0, or whatever the UNIX release between 1.0 and 3.0 was
called, got in there somewhere; System III was 3.0.1 or something near
to that), which had quite significant V7 content (e.g., the file system,
the "stat()" call, environment variables, Bourne shell), although it had
a V6-flavored tty driver.  System III also had a fair bit of PWB
content. 

(Note: when I say "V7 content", I mean that the items in question first
appeared *in widely-available releases outside AT&T* in V7.  The branch
of the family DAG that contains UNIX/TS 1.0, S3, and the S5 releases
probably first split off from the Research branch before V7, but after
the V7 file system first appeared.

And no, I said "family DAG", not "DAG's family"; as far as I know, Doug
is the only member of the Gwyn family involved with UNIX. :-))