2.10.1.  Example

The example asks for the tomcat home only if the environment variable TOMCAT_HOME is undefined.

build.xml

...

<target name="checkup">

<!-- verify TOMCAT_HOME enviroment variable -->

<execute if="${env.TOMCAT_HOME}">

<property name="tomcat" value="${env.TOMCAT_HOME}"/>

</execute>

<execute unless="tomcat">

<input addproperty="tomcat">

No TOMCAT_HOME enviroment variable found.

Enter TOMCAT_HOME:

</input>

</execute>

<fail unless="tomcat">

no TOMCAT_HOME defined

</fail>

<!-- -->

</target>

...