title: How to restrict grep to search only the one column within a CSV file, but to output matching lines in their entirety?
body: <p>How can I use <code>grep</code> to search only one column within a CSV file, but after a match is found, to output the entire line? E.g.:</p>
  
  <pre><code>fish @ eats worms
  bear @ eats fish
  </code></pre>
  
  <p>Searching for <code>fish</code> in column 2 will output: <code>bear @ eats fish</code>.</p>