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From: arisawa@ar.aichi-u.ac.jp
Subject: Re: [9fans] Environment variable
Date: Wed,  9 Aug 2006 21:04:32 +0900
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
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On 2006/08/09, at 20:39, Martin Neubauer wrote:
> Well, now I have tried. It doesn't do the trick.
> b=`{cat /env/a}^''
> gives a warning if a is an empty string but works otherwise.
> b=$`{basename /env/a}
> is the cleanest solution, I think.

The solution is same as
b=$a
this works if a is already a shell variable.

Try
c=''	# null string
a=()
b=()
cp /env/c /env/a
then exec
b=$`{basename /env/a}