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From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.sources.wanted,comp.unix.shell
Subject: Re: tcsh *binaries* are also available
Message-ID: <7054@auspex.auspex.com>
Date: 6 Apr 91 22:17:38 GMT
References: <1991Apr2.211344.23204@msuinfo.cl.msu.edu> <1046@keele.keele.ac.uk>
Followup-To: comp.sources.wanted
Organization: Auspex Systems, Santa Clara
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>You need to have tcsh put into /etc/shells so that chsh knows that it's
>a bona fide shell.

...

>This is a security feature in SunOS 4+ I believe.

It's a security feature in 4.3BSD; SunOS 4.x picked it up from there.