#Minutes Hours Day of Month Month Day of Week Command
#0 to 59 0 to 23 1 to 31 1 to 12 0(Sunday) to 6(Saturday) Shell Command
#run every 15 minutes
*/15 * * * * curl http://example.com/controller/action >/dev/null 2>&1
#run every 3 hours
0 */3 * * * curl http://example.com/controller/action >/dev/null 2>&1
#run every after 2 days at 1AM
0 1 */2 * * curl http://example.com/controller/action >/dev/null 2>&1
#run every after 2 months on day 1
0 0 1 */2 * curl http://example.com/controller/action >/dev/null 2>&1
#run every Tuesday,Thursday,Saturday at 1AM
0 1 * * 2,4,6 curl http://example.com/controller/action >/dev/null 2>&1
>/dev/null 2>&1 suppresses the output of curl