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From: paul@FLEETWOOD.CC.UMICH.EDU ('da Kingfish)
Newsgroups: comp.sys.apollo
Subject: Re:  Weird vi bug
Message-ID: <8711152200.AA04047@fleetwood.cc.umich.edu>
Date: Sun, 15-Nov-87 16:00:50 EST
Article-I.D.: fleetwoo.8711152200.AA04047
Posted: Sun Nov 15 16:00:50 1987
Date-Received: Tue, 17-Nov-87 03:29:09 EST
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David Ackerman <ack%caldwr.uucp@ucdavis.ucdavis.edu> says ...

	We discovered a very strange bug in Apollo implementation of vi, at least the
	version we have. If the characters "ei:X:" ...

That's an undocumented "feature" of vi, and was not added by Apollo.
If you have a file that has what looks like ex/vi commands in the first
line, I believe, those commands will be executed.  The idea was to
customize vi on a file by file basis.

There are enough problems with this that many people changed vi locally
not to do this.  I think recent versions of vi may have it turned off,
I don't know.

--paul