title: Replace vim selection with output of shell command
body: <p>I need to pass some selected text in vim to a curl command as a parameter value. For example. I need to be able to run </p>
  
  <pre><code>curl -sSd css="body { border-radius: 5px; }" http://prefixr.com/api/index.php
  </code></pre>
  
  <p>from vim. Obviously, the "body { border-radius: 5px; }" part will be dynamic. Usually, a visual mode selection in vim.</p>
  
  <p>How do I get the selected text and pass it as a parameter to curl?</p>