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From: Zefram <zefram@tao.co.uk>
Message-Id: <199806151428.PAA10680@taos.demon.co.uk>
Subject: Re: Wrong emulation mode if exec'd by su
To: aumuelle@mi.uni-erlangen.de
Date: Mon, 15 Jun 1998 15:28:07 +0100 (BST)
Cc: zsh-workers@math.gatech.edu, aumuelle@mi.mi.uni-erlangen.de
In-Reply-To: <199806151358.PAA13243@helena.mi.uni-erlangen.de> from "Martin Aumueller" at Jun 15, 98 03:58:41 pm
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Martin Aumueller wrote:
>I have a problem with zsh-3.1.4: If I su - to an account the zsh sees
>"su" as executable name -- starting with 's' -- and thus switches to
>Bourne shell emulation mode, not the behaviour desired by me. I have
>solved this problem by testing the full executable names against "sh",
>"csh" and "ksh" with strcmp and now it works as I expect it.

The original behaviour is correct.  "su" really should not give the shell
this weird argv[0] (some versions don't).  But on the older systems where
it does, it's more likely that the shell being invoked is supposed to
be sh, so treating a name of "su" as "sh" is the best behaviour.

To get round this problem, if you can't fix su, put an "exec zsh -l"
in your .profile.  Optionally change your login shell to /bin/sh.

>However, in the patch below I didn't take into account the case
>starting with 'b', don't know what that should be,

"bsh" == Bourne shell.

-zefram