How to list active sub-modules in a Maven project?

Question

I have a complex project where there are many directories that have POM files, but only some of which are sub-modules (possibly transitively) of a particular parent project.

Answer 1

The solution I found is quite simple:

mvn -B -f "$pom_file" org.codehaus.mojo:exec-maven-plugin:1.4.0:exec \
    -Dexec.executable=/usr/bin/echo \
    -Dexec.args='${basedir}/pom.xml'| \
    grep -v '\['

This is a little bit tricky due to the need to grep out the [INFO|WARNING|ERROR] lines and make it usable for scripting but saved me a lot of time since you can put any expression there.