title: How to split a file using a numeric suffix
body: <p>I'm using the following command to split a file.  It should split every 50,000 lines and use a 4-digit numeric suffix.  The file is about 140 million lines.</p>
  
  <pre><code>split -d -l -n 4 50000 domains.xml domains_
  </code></pre>
  
  <p>But when I run that I am getting this error:</p>
  
  <pre><code>split: -n: invalid number of lines
  Try `split --help' for more information.
  </code></pre>
  
  <p>What's the correct command for this?</p>