>ant -Dpropname=xxx // correct usage
>ant // incorrect usage of my build
>
>Can I test a property existence?
>
>if propname not exists (
> echo "Give more command line arg"
> exit ant running
>)
You could check that with the <isset> condition.
In that case you would combine it with fail:
<fail>
Give more command line arg
<condition>
<isset property="propname"/>
</condition>
</fail>
If you can work with default values you can easily set that:
<property name="propname" value="defaultvalue"/>
Because Ant properties are immutable (once set they cant be changed)
Ant will use the user value (from the command line) if given, otherwise
the default.
For an introduction have a look at the tutorial
http://ant.apache.org/manual/tutorial-HelloWorldWithAnt.html
Jan
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