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From: Ron Natalie  
Newsgroups: net.unix-wizards
Subject: Re:  disallowing subshell in More
Message-ID: <8189@brl-tgr.ARPA>
Date: Sun, 10-Feb-85 16:07:14 EST
Article-I.D.: brl-tgr.8189
Posted: Sun Feb 10 16:07:14 1985
Date-Received: Wed, 13-Feb-85 02:20:40 EST
Sender: news@brl-tgr.ARPA
Organization: Ballistic Research Lab
Lines: 6

Just zap the SHELL environment variable to something that is unexecutable
(be sure that it isn't something that the user can put an executable file
into however).  More then will say "exec failed" at any attempt to use
the ! feature.

-Ron