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

Use either

$ gem list --no-version | xargs gem uninstall -ax

or

$ sudo gem list --no-version | xargs sudo gem uninstall -ax

Depending on what you want, you may need to execute both, because "gem list" and "sudo gem list" provide independent lists.

Do not mix a normal "gem list" with a sudo-ed "gem uninstall" nor the other way around otherwise you may end up uninstalling sudo-installed gems (former) or getting a lot of errors (latter).