title: redirect output from tr
body: <p>I'm trying to replace &lt;92> with single quote in a webpage using tr.  When I do </p>
  
  <pre><code>tr "&lt;92&gt;" "'" &lt; index.html
  </code></pre>
  
  <p>the output shows me that the replacement has occurred.  So to edit in place (or as close as tr gets) I do</p>
  
  <pre><code>tr "&lt;92&gt;" "'" &lt; index.html &gt;&gt; index.html
  </code></pre>
  
  <p>The file is unchanged.  For reference, redirecting to another file altogether doesn't work correctly either. </p>