title: How to grep for contents after pattern?
body: <p>Given a file, for example:</p>
  
  <pre><code>potato: 1234
  apple: 5678
  potato: 5432
  grape: 4567
  banana: 5432
  sushi: 56789
  </code></pre>
  
  <p>I'd like to grep for all lines that start with <code>potato:</code> but only pipe the numbers that follow <code>potato:</code>.  So in the above example, the output would be:</p>
  
  <pre><code>1234
  5432
  </code></pre>
  
  <p>How can I do that?</p>