Uninstall all installed gems, in OSX?

Question

There are instances where I would like to revert and uninstall all previous gem installations.

For instance, I needed to assist a friend migrate their rails developm

Answer 1

When trying to remove gems installed as root, xargs seems to halt when it encounters an error trying to uninstall a default gem:

sudo gem list | cut -d" " -f1 | xargs gem uninstall -aIx
# ERROR:  While executing gem ... (Gem::InstallError)
#    gem "test-unit" cannot be uninstalled because it is a default gem

This won't work for everyone, but here's what I used instead:

sudo for gem (`gem list | cut -d" " -f1`); do gem uninstall $gem -aIx; done