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Re: test -n "${var+set}"?
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From: |
Paul Eggert |
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Subject: |
Re: test -n "${var+set}"? |
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Date: |
18 Feb 2004 00:51:36 -0800 |
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User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 |
Derek Robert Price <address@hidden> writes:
> Just wondering what the logic behind all the constructs like, `test
> "${var+set} = set', was in recently generated configure scripts.
I suspect it's the shortest portable test for whether a shell variable
is set. Can you think of a shorter?