I have a php script in <mydomain.com/file.php> which I want to execute every 30 mins. I know cron job is the way to go. I haven't set up cron jobs in the past, can anyone guide me about how to go about it? Like, in the Cron Jobs section of the cpanel, what is the command that I need to give? And what about the Hour, Day, Month, Weekday settings?