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

First make sure you have at least gem version 2.1.0

gem update --system
gem --version
# 2.6.4

To uninstall simply run:

gem uninstall --all

You may need to use the sudo command:

sudo gem uninstall --all