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From: gwyn@BRL-VLD.ARPA
Newsgroups: net.unix
Subject: Re:  multiple versions
Message-ID: <750@sri-arpa.UUCP>
Date: Sat, 4-Aug-84 18:12:04 EDT
Article-I.D.: sri-arpa.750
Posted: Sat Aug  4 18:12:04 1984
Date-Received: Mon, 6-Aug-84 01:04:15 EDT
Lines: 8

From:      Doug Gwyn (VLD/VMB) 

cc -o foo.c foo.c
will not clobber your source on UNIX System V.  This trivial
safety check (as well as others to keep "cat" from writing the
file it is reading and so forth) could easily be added to older
versions of UNIX.  As to keeping backup copies of source code,
that is what SCCS is for.