title: `-bash: rbenv: command not found` comes up every time I open a terminal window. How do I fix this?
body: <p>I tried installing rails using rbenv, but was unsuccessful.  I then uninstalled rbenv and installed rails with rvm.  Now every time I open my terminal window I get the follow</p>
  
  <pre><code> Last login: Wed Jul 17 21:59:43 on ttys001
   -bash: rbenv: command not found
   -bash: rbenv: command not found
   name-Mac-mini:~ name$
  </code></pre>
  
  <p>When I use homebrew to uninstall I get</p>
  
  <pre><code>$ brew uninstall rbenv
  Error: No such keg: /usr/local/Cellar/rbenv
  </code></pre>
  
  <p>I have mac-mini running Mountain Lion 10.8.4.  Any ideas on how I can get fix this?</p>