title: How can I find all ruby gems installed with sudo gem install?
body: <p>I'm learning to code on ruby and before knowing any better I installed some  gems with <code>sudo gem install name-of-gem</code>, which is now wreaking havoc with some projects. I've read the gem documentation and have not found a way to show which gems have been installed with <code>sudo</code>. How can I do find them?</p>