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unset FOO

From: Peter Seebach
Subject: unset FOO
Date: Wed, 17 Sep 2008 19:35:57 -0500

In regards to worries about "unset FOO" not working if FOO is not set:

${FOO+unset FOO}

Is this crazy or clever?  It works in Solaris sh.  (I know, in most cases,
it's sufficient to just empty the variable, but sometimes it'd be nice to
be able to distinguish between empty and unset.)


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