Date: Sat, 18 Jul 1998 13:49:05 +0200 From: Johann Visagie <wjv@cityip.co.za> To: Greg Lehey <grog@lemis.com>, FreeBSD Questions <questions@FreeBSD.ORG> Subject: Re: Unsetting exported environment variables? Message-ID: <19980718134905.A27927@cityip.co.za> In-Reply-To: <19980718155422.D376@freebie.lemis.com>; from Greg Lehey on Sat, Jul 18, 1998 at 03:54:22PM %2B0930 References: <19980718155422.D376@freebie.lemis.com>
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On Sat, 18 Jul 1998 at 15:54 SAT, Greg Lehey wrote:
>
> If you try to run SuperProbe with the variable DISPLAY set, it will
> refuse to run. That's OK with the C shell, you just enter:
>
> % unsetenv DISPLAY
> % /usr/X11R6/bin/SuperProbe
>
> Unfortunately, to my knowledge there's no similar function in the
> Bourne shell. You can set the variable to the null string:
In GNU bash, the shell builtin "export" has a flag "-n", which allows you to
remove the export property from a particular variable. This does not, to the
best of my knowledge, apply to the standard Bourne shell.
Hmmm, I've just had a look at the man page for sh(1), and found the
following:
unset name ...
The specified variables and functions are unset and
unexported.
I've just tested it, and it seems to behave similarly to the C shell's
unsetenv.
-- V
Johann Visagie | Email: wjv@CityIP.co.za | Tel: +27 21 419-7878
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