title: Delete/clear active cron job
body: <p>How can I delete or clear all the cron job that I made previously and just run new cron job that I assigned? I'm using <code>crontab -r</code> but it just clear in the crontab display, but it still runs that cron job and the previous cron job that I have already deleted by using that code.</p>
  <p>After I clear cron job using <code>crontab -r</code>, I run <code>crontab -l</code> and it shows this output.</p>
  <pre><code>No crontab for trygcp
  </code></pre>