title: Enable/Disable tasks in Crontab by Bash/Shell
body: <p>Is there a way to enable and disable Crontab tasks using Bash/Shell?</p>
  
  <p>So when the user starts Server 1, it will enable the Server 1 Crontab line and so on.
  And when the user stops Server 1, the Server 1 Crontab line get disabled (#).
  Is this possible and how?</p>
  
  <p>Thanks in advance</p>
  
  <pre><code>*/1 * * * * Server 1 check
  */1 * * * * Server 2 check
  */1 * * * * Server 3 check
  </code></pre>