[root@hadoop2 spider]# ps -ef|grep crond

root 32420 28821 0 09:41 pts/2 00:00:00 grep crond

[root@hadoop2 spider]# service crond start

Starting crond: [ OK ]

[root@hadoop2 spider]# ps -ef|grep crond

root 32437 1 0 09:41 ? 00:00:00 crond

root 32440 28821 0 09:41 pts/2 00:00:00 grep crond

[root@hadoop2 spider]#