Uninstalling all gems Ruby 2.0.0

Question

It seems that ruby 2.0.0 has added \"default\" gems to the mix and makes them non removable by gem uninstall.

How can you remove all non default gems?

Answer 1

I have not yet found a better answer than to exclude the "default" gems:

/usr/local/bin/gem list --no-versions | \
grep -v -E "(bigdecimal|io-console|json|minitest|psych|rake|rdoc|test-unit)" | \
xargs --no-run-if-empty /usr/local/bin/gem uninstall --executables --user-install --all --force