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[Help-bash] test -v

From: Jesse Molina
Subject: [Help-bash] test -v
Date: Sun, 29 Jan 2012 04:32:41 -0700
User-agent: Mozilla/5.0 (X11; Linux i686; rv:9.0.1) Gecko/20111221 Firefox/9.0.1 SeaMonkey/2.6.1

Can someone cite an example of test -v which works? It is supposed to test if a variable has been defined, but I am confused.

Normally I would [[ -z "$THINGY" ]] , but I thought I would give -v a shot. I get the feeling I should forget I ever tried.

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