title: Error in crontab entry
body: <p>I have been trying to make a cron entry for a shell script:</p>
  
  <pre><code>50 */4 * * * /path/script-file.sh &gt; /dev/null 2&gt;&amp;1
  </code></pre>
  
  <p>aimed to run the script at HH:50 at a frequency of 4 hours. But this errors out with the message:</p>
  
  <blockquote>
    <p>crontab: error on previous line; unexpected character found in line.</p>
    
    <p>crontab: errors detected in input, no crontab file generated.</p>
  </blockquote>
  
  <p>I removed the "/4" and the error vanished, but I know that cron does allow this format. Does anybody know what the issue could be?</p>
  
  <p>Thank you very much for any help.</p>