From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Wed,  9 Aug 2006 14:26:20 +0200
From: Martin Neubauer <m.ne@gmx.net>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] Environment variable
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* arisawa@ar.aichi-u.ac.jp (arisawa@ar.aichi-u.ac.jp) wrote:
> 
> 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}

I see what you are trying to accomplish. Probably
b=$"`{cat /env/a}
will do.