title: How to install Ruby 2.2.2 using RVM
body: <p>I ran <code>rvm -v</code> and it returned <code>rvm 1.29.1</code> so I ran <code>rvm install 2.2.2</code> to upgrade the Ruby version. </p>
  
  <p>It showed:</p>
  
  <pre><code>ruby-2.2.2 - #removing rubies/ruby-2.2.2..
  Searching for binary rubies, this might take some time.
  Found remote file https://rvm_io.global.ssl.fastly.net/binaries/osx/10.11/x86_64/ruby-2.2.2.tar.bz2
  ruby-2.2.2 - #configure
  ruby-2.2.2 - #download
  ruby-2.2.2 - #validate archive
  ruby-2.2.2 - #extract
  ruby-2.2.2 - #validate binary
  ruby-2.2.2 - #setup
  ruby-2.2.2 - #gemset created /usr/local/rvm/gems/ruby-2.2.2@global
  ruby-2.2.2 - #importing gemset /usr/local/rvm/gemsets/global.gems...............
  ruby-2.2.2 - #generating global wrappers........
  ruby-2.2.2 - #gemset created /usr/local/rvm/gems/ruby-2.2.2
  ruby-2.2.2 - #importing gemsetfile /usr/local/rvm/gemsets/default.gems evaluated to empty gem list
  ruby-2.2.2 - #generating default wrappers........
  Making gemset ruby-2.2.2 pristine..............................................-
  Making gemset ruby-2.2.2@global pristine.......................................|
  </code></pre>
  
  <p>I ran <code>rvm -v</code> again and it showed <code>rvm 1.29.1</code>. It means RVM did not install or did not work. Any suggestions?</p>