title: not able to run .rb file in `Sublime Text2`
body: <p>whenever I am trying to save and run a .rb file through the <code>Sublime Text2</code>, getting an error:
  <code>Unable to save /usr/Examples/SO.rb</code> and the below:</p>
  
  <pre><code>[Errno 2] No such file or directory
  [cmd:  [u'ruby', u'/usr/Examples/SO.rb']]
  [dir:  /usr/Examples]
  [path: /usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games]
  [Finished]
  </code></pre>
  
  <p>Can anyone help me to solve this issue?</p>
  
  <p><strong>EDIT</strong></p>
  
  <pre><code>2.0.0p0 :001 &gt; puts ENV['PATH']
  /home/kirti/.rvm/gems/ruby-2.0.0-p0/bin:/home/kirti/.rvm/gems/ruby-2.0.0-p0@global/bin:/home/kirti/.rvm/rubies/ruby-2.0.0-p0/bin:/home/kirti/.rvm/gems/ruby-2.0.0-p0/bin:/home/kirti/.rvm/gems/ruby-2.0.0-p0@global/bin:/home/kirti/.rvm/rubies/ruby-2.0.0-p0/bin:/home/kirti/.rvm/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/kirti/.rvm/bin
   =&gt; nil
  
  kirti@kirti-Aspire-5733Z:~$ which ruby
  /home/kirti/.rvm/bin/ruby
  </code></pre>