title: Add headers to a file
body: <p>I have a file containing data like below:</p>
  
  <pre><code>88_NPDJ    565    789   3434   54454
  98HGJDN    945    453   3453   23423
  ...
  ...
  ...
  </code></pre>
  
  <p>whats the best way to add headers to the file? After data has been entered into the file. The data is tab delimited.</p>