title: Completely reinstalling Ruby Rails and Gem on Mac OS X
body: <p>I've recently started teaching myself Ruby on Rails, and it's all going well except I'm looking to completely reinstall Ruby, Rails and Gem.</p>
  
  <p>I think I got a bit too excited at some point and deleted/modified some files or folders I shouldn't have, so I just want to get my system back to its original state so that I can reinstall the necessary Ruby, Rails and Gem bits.</p>
  
  <p>I've read in places that I can install something called rvm to do this, but right now I just want to keep my system as simple as possible so that my understanding can keep up.</p>
  
  <p>Any help would be appreciated.</p>
  
  <p>Many thanks.</p>