title: virtualenv: command not found after installed with Pip on Mac
body: <p>I am trying to install VirtualEnv on my Mac. I have installed Python and Pip with brew. After running 
  pip install virtualenv
  When I try to use it I am getting:</p>
  
  <pre><code>bash: "virtualenv: command not found"
  </code></pre>
  
  <p>I am unsure where virtualenv has been installed. 
  My PATH environment variable contains: </p>
  
  <p><code>/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/usr/X11/bin</code></p>
  
  <p>I am using: Mac Os 10.7.5</p>