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To: Curt Sampson <cjs@portal.ca>
cc: Andrew Gierth <andrew@erlenstar.demon.co.uk>, hackers@freebsd.org
Subject: Re: /etc/netstart bogons.. 
In-reply-to: <Pine.NEB.3.93.970426214717.24845C-100000@gnostic.cynic.net> 
Date: Sun, 27 Apr 1997 21:50:18 +1000
From: Giles Lean <giles@nemeton.com.au>
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On Sat, 26 Apr 1997 21:47:32 -0700 (PDT)  Curt Sampson wrote:

> > Can't let this slip past: "" and unset are certainly not the same in sh.
> 
> So how do we test for the difference between the two?

Use ${notset-value}.  Use ${notset:-value} if "" should count as
unset.

Giles