title: Sed not working with find command
body: <p>I'm trying to run this sed script on all the files in a directory:</p>
  
  <p>sed.s:</p>
  
  <pre><code>/&lt;constants&gt;/a\
  &lt;const type="profElem" name="mission_description" value="NCEP and NCAR Reanalysis Monthly Means and Other Derived Variables"/&gt;
  </code></pre>
  
  <p>but whenever I run:</p>
  
  <pre><code>find . -exec sed -f sed.s -i {} \; 
  </code></pre>
  
  <p>I get the error:</p>
  
  <pre><code>sed: -i may not be used with stdin
  </code></pre>
  
  <p>How do I get this to work?</p>