title: Changing a (full pathname) line using sed `s` operation
body: <p>I'm trying to change <code>#!/usr/bin/python</code> to <code>#!/usr/bin/python2.6</code></p>
  
  <p>I've tried the following command line:</p>
  
  <pre><code>sed -i -e 's/.#!/usr/bin/python.*/#!/usr/bin/python2.6/' /usr/bin/yum
  </code></pre>
  
  <p>...which returns the following error:</p>
  
  <pre><code>sed: -e expression #1, char 11: unknown option to `s'
  </code></pre>
  
  <p>I can't find a good answer anywhere on Google. </p>
  
  <p>Thanks in advance.</p>