Is IOEx necessary

[cstamas]

Env variable related methods like these:
https://github.com/codehaus-plexus/plexus-utils/blob/master/src/main/java/org/codehaus/plexus/util/cli/CommandLineUtils.java#L361
https://github.com/codehaus-plexus/plexus-utils/blob/master/src/main/java/org/codehaus/plexus/util/cli/CommandLineUtils.java#L377

Is throws IOException necessary? If so, why?

[michael-o]

I think it's a relic. I my opinion, we can throw it away.