title: How do i grep a list of words with a specific letter listed twice or more?
body: <p>If I'm supposted to grep out every word that contains the letter 'w' twice, how am I supposed to do this?</p>
  
  <p>When I try all I get is the words with two 'w's next to each other.</p>
  
  <p>I've tried:</p>
  
  <pre><code>grep -P "(?=.*w)(?=.*w)" /usr/share/dict/words
  egrep "(?=.*w)(?=.*w)" /usr/share/dict/words
  cat /usr/share/dict/words | grep 'w' | grep 'w'
  </code></pre>
  
  <p>but nothing gives me the results that I want.  How can I do that?</p>