If you don’t use gemsets, this can occur  to  you. Although I do use gemsets almost always I had a ruby project running on the rvm 1.9.2 with messed up gems, many versions of each one etc. Anyway I decided I want to cleanup all the gems that are installed under this ruby.

The most practical way to delete all gems and all versions that I run into is the following

gem list | cut -d" " -f1 | xargs gem uninstall -aIx

It works! Just try it out..

Cheers.