title: How to tee to stderr?
body: <p>I want to split <code>stdout</code> so that it is printed both to <code>stdout</code> and <code>stderr</code>.  This sounds like a job for <code>tee</code> but the syntax is evading me -</p>
  
  <pre><code>./script.sh | tee stderr
  </code></pre>
  
  <p>Of course, how should <code>stderr</code> actually be referred to here?</p>