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Date: Fri, 19 Aug 2011 09:14:54 -0500 (CDT)
From: Robert Bonomi <bonomi@mail.r-bonomi.com>
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To: freebsd-questions@freebsd.org, v.velox@vvelox.net
In-Reply-To: <20110819072234.38e655d6@vixen42.vulpes.vvelox.net>
Cc: 
Subject: Re: wpa_cli issues
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> From owner-freebsd-questions@freebsd.org  Fri Aug 19 07:41:44 2011
> Date: Fri, 19 Aug 2011 07:22:34 -0500
> From: "Zane C. B-H." <v.velox@vvelox.net>
> To: FreeBSD Questions <freebsd-questions@freebsd.org>
> Subject: wpa_cli issues
>
> Is there any way to undefine a variable once it has been set?

*As(stated*, the answer involves the offspring of the mating of a rhinoceros
and an elephand.

=GUESSING= that you mean a shell 'envionment variable', the answer is 'yes'.
_How_ one can do it depends on the shell (*unspecified*!) being used.
'unsetenv' _may_ do the trick.  Alternatively a variable assignment with
no value (.e.g "VARIABLE=") may work.