title: how to define script interpreter with shebang
body: <p>It is clear that one can use the</p>
  
  <pre><code>#!/usr/bin/perl
  </code></pre>
  
  <p>shebang notation in the very first line of a script to define the interpreter. However, this presupposes an interpreter that ignores hashmark-starting lines as comments. How can one use an interpreter that does not have this feature?</p>