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Date: Tue, 19 Apr 2011 18:22:48 +0100
From: Stephane Chazelas <stephane_chazelas@yahoo.fr>
To: Thorsten Kampe <thorsten@thorstenkampe.de>
Cc: zsh-users@zsh.org
Subject: Re: Test if parameter is set
Message-ID: <20110419172248.GA6867@yahoo.fr>
Mail-Followup-To: Thorsten Kampe <thorsten@thorstenkampe.de>,
	zsh-users@zsh.org
References: <iokedv$c96$1@dough.gmane.org>
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User-Agent: Mutt/1.5.21 (2010-09-15)

2011-04-19 18:48:57 +0200, Thorsten Kampe:
> Hi,
> 
> how can I test if a parameter is set?
> 
> Like in...
> 
> if $VAR_IS_SET; then
>     print Variable is set
> else
>     print Variable is not set
> fi
[...]

if (($+VAR))

or portably:

if [ -n "${VAR+x}" ]

-- 
Stephane