How to run a daily cron job? [nginx]

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http://serverfault.com – Server: nginx/0.8.54 OS: Ubuntu 11.04 Host: Rackspace UK Cloud Access: Full Root etc I have a PHP script in my cloud server: /var/www/www.site.com/web/cron_tasks.hash/report.php I want to run this task every day just once - the time does not matter. It would be ideal if I could run it in the morning. Also how can I view a list of already listed cron jobs? Sorry but I can't find an Nginx server question for this. (HowTos)