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From: Thorsten Kampe <thorsten@thorstenkampe.de>
Subject: `[[ -n $VAR ]]` equal to `[[ $VAR ]]`?
Date: Fri, 10 Apr 2015 03:23:29 +0200
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Hi,

this is kind of a follow-up to 
http://www.zsh.org/mla/users/2011/msg00284.html .

Basically the solutions were `((+VAR))` for zsh and `[[ -n 
${VAR+stuff} ]]` for bash and zsh.

Now my question is, isn't `[[ -n $VAR ]]` equivalent to `[[ $VAR ]]`? 
(`[[ -n ${VAR+stuff} ]]` equivalent to `[[ ${VAR+stuff} ]]`)

Thorsten