如何通过参数将“！”传递给ant属性？

Question

I have an ant target like this.

<target name="test">
<condition property="expression" value="${expression}" else="">
      <isset property="expression"/>
</condition>
    <echo>Expression is ${expression }</echo>
</target>

I want to set its property with a string which contains logical operators like

&& || ! etc.
ant test –Dexpression="A||!B"
ant test –Dexpression="!abc"

But I found it can't accept the exclamation mark "!".

The echo is

A||B
abc

How can I pass the "!" to ant property from parameter?

Answer 1

You need to put expression in single quotes. This way bash will not interpret it.

ant test –Dexpression='A||!B'
ant test –Dexpression='!abc'