Every now and then I want to exclude one or more modules from a rather large reactor build.
One reason for this can be: The respective module has tests that take long time to execute and I know that I don't need to execute them.
Introducing yet another profile for this is not desirable for various reasons.
So, something like an opposite to -pl would come in handy. Let's say "-el" for "exclude list".
Calling mvn -el a1,c would build all modules execpt a1 and c.