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Subject: zsh as sh hates `unset CDPATH'
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From: SL Baur <steve@xemacs.org>
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Date: 14 May 1998 13:10:06 -0700
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(Apologies if this is fixed in the 3.1.3 beta which I just found out
about moments ago.  Thanks for a wonderful shell, I've been running 3.1.2
as /bin/sh for some months now).

I've verified the existence of this bug in 3.1.2, 3.0.5, 3.0.4, and
2.6beta20 on various flavors of Linux libc5 and GNU libc.

Repeat by:
zsh$ cd /tmp
zsh$ ln -s /bin/zsh ./sh
zsh$ ./sh
sh$ unset CDPATH
zsh: 20286 segmentation fault  ./sh
zsh$