title: Awk/Unix group by
body: <p>have this text file:</p>
  
  <pre><code>name, age
  joe,42
  jim,20
  bob,15
  mike,24
  mike,15
  mike,54
  bob,21
  </code></pre>
  
  <p>Trying to get this (count):</p>
  
  <pre><code>joe 1
  jim 1
  bob 2
  mike 3
  </code></pre>
  
  <p>Thanks,</p>