title: Where to modify the value of $GEM_PATH?
body: <p>My current $GEM_PATH is "/home/me/.rvm/gems/ruby-1.9.2-p318", and i want to revert it back to ""/home/me/.rvm/gems/ruby-1.9.2-p290" , what "rc" file do i need to edit . </p>
  
  <p>Thanks!</p>