title: grep - search for "<?\n" at start of a file
body: <p>I have a hunch that I should probably be using ack or egrep instead, but what should I use to basically look for</p>
  
  <pre><code>&lt;?
  </code></pre>
  
  <p>at the start of a file? I'm trying to find all files that contain the php short open tag since I migrated a bunch of legacy scripts to a relatively new server with the latest php 5.</p>
  
  <p>I know the regex would probably be <code>'/^&lt;\?\n/'</code></p>