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Re: Test if parameter is set

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From: Stephane Chazelas <stephane_chazelas@xxxxxxxx>
To: Thorsten Kampe <thorsten@xxxxxxxxxxxxxxxx>
Subject: Re: Test if parameter is set
Date: Tue, 19 Apr 2011 18:22:48 +0100
Cc: zsh-users@xxxxxxx
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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

References:
- Test if parameter is set
  - From: Thorsten Kampe

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