Since I already had a small framework to automate work processes I could implement this functionality nicely in literally 10 lines: all I had to do is grab the offending files from the output of rubocop --parallel and feed them to rubocop --auto-correct . It’s in the gem called autotwow (as in [auto]mated [w]ay [o]f [w]orking) and can be used as:

gem install autowow

autowow rubocop_parallel_autocorrect / aw rpa

To make it even more simple & faster one could do the same thing using the rubocop gem’s API (unfortunately non-public), or I’m sure some bash masters can do a simple one-liner.