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Date: Wed, 1 Aug 2007 15:26:57 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: tcsh 6.15.00 TZ environmental variable - unexpected behaviour.
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On Aug  1 12:09, roger DOT broadbent AT dstintl DOT com wrote:
> It appears that tcsh treats the "TZ" environmental variable in a special
> way - upon entry into tcsh, some commands see TZ as set. Using unsetenv to
> attempt to unset it is fruitless:
> 
>     bash-3.2$ unset TZ
>     bash-3.2$ printenv TZ
>     bash-3.2$ echo $TZ
> 
>     bash-3.2$ bash -c "printenv TZ"
>     bash-3.2$ tcsh
>     tcsh$ printenv TZ
>     tcsh$ echo $TZ
>     GMTST0GMTDT-1,M3.5.0/1,M10.5.0/2
>     tcsh$ bash -c "printenv TZ"
>     GMTST0GMTDT-1,M3.5.0/1,M10.5.0/2
>     tcsh$ unsetenv TZ
>     tcsh$ printenv TZ
>     tcsh$ echo $TZ
>     GMTST0GMTDT-1,M3.5.0/1,M10.5.0/2
>     tcsh$ bash -c "printenv TZ"
>     GMTST0GMTDT-1,M3.5.0/1,M10.5.0/2

It's not tcsh but Cygwin.  tcsh just happens to call tzset once in a
while, which, under Cygwin, sets the TZ environment variable.  This is
arguably wrong, since the tzset() function is per POSIX supposed to
*read* the TZ environment variable, but it doesn't set it.

I fixed that in Cygwin in CVS, but the patch will not make it into a
release for some time.  So, better find some workaround (like, for
instance, create wrapper scripts around your MSVC applications using
bash).

> All opinions expressed are my own [etc, etc, etc]

Disclaimers like that are against site policy, please see
http://sources.redhat.com/lists.html.


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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