Re: set but null

On Sat, Sep 20, 2003 at 05:42:52PM -0500, David W. Tamkin wrote:
> I said that the way to test whether a variable is set but null is,
>
> : * $ !${VAR+!}${VAR:+!}
>
> Dallman requested an explanation.  OK.
>
> The condition asks for $-interpretation, so let's $-interpret it.
>
> [snip]
Most excellent!  Thank you, David, for another little bit of
genius; even if a rerun for you.

Dallman

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