title: Rescheduling a cron job remotely using a web app
body: <p>I have a few cron jobs at server machine scheduled to do few things. I want to let user modify those cron jobs using a web application (jsp page).  So lets say (example scenario) some job is scheduled to run at 2 PM, I want user the option to change its time. </p>
  
  <p>It looked very trivial to start with, but now I am stuck. I am new to Linux. How to create cron jobs currently is :  crontab - e   ; and then I manually add new jobs as required. But I want to provide this capability to a remote user through a web interface. </p>
  
  <p>Please help !</p>