title: Execute a goal from commandline in all submodules
body: <p>this is a snippet from a multi-module parent pom. How can I run a goal in all submodules of the project?</p>
  
  <pre><code>
  &lt;modules>
      &lt;module>../utp&lt;/module>
      &lt;module>../testdependency&lt;/module>
  &lt;/modules>
  </code></pre>
  
  <p>When I try to run this goal by <code>mvn -am -pl utp help:evaluate -Dexpression=project.artifactId</code>, I'll only get the result for the parent pom, I don't get any result for the utp and eventual dependencies.<br/>
  How can I run a goal on all submodules of a project?</p>