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From Sergei Dubov <sdu...@gmail.com>
Subject Checking for non-existence of environment variable
Date Tue, 24 Jan 2006 20:47:33 GMT
Hi guys,

I am sure this question has been asked before. But I did my research and 
found no answers whatsoever.

Basically I am trying to check for existence of an environment variable. 
And if it is not defined I want the script to fail.

<project name="base" basedir="." default="echo-env">
     <property environment="env"/>

     <target name="echo-env">
         <echo>${env.NO_VALUE}</echo>
     </target>
</project>

Basically this will return "${env.NO_VALUE}".

And potential <available> check will think it actually HAS value. Is 
there any way to make Ant recognize that System.getenv("NO_VALUE") 
returns null?

Thank you very much beforehand,

Serge.

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