title: What is your latest useful Perl one-liner (or a pipe involving Perl)?
body: <p>The one-liner should:</p>
  
  <ul>
  <li>solve a real-world problem</li>
  <li>not be extensively cryptic (should be easy to understand and reproduce)</li>
  <li>be worth the time it takes to write it (should not be too clever)</li>
  </ul>
  
  <p>I'm looking for practical tips and tricks (complementary examples for <code>perldoc perlrun</code>).</p>