1、yum install vixie-cron
yum install crontabs
2. Start and stop
service crond start
service crond stop
service crond restart
3. How to use
Execute once an hour
vi /etc/crontab
0 */1 * * * curl -d "is_cron=1" http://hosts/weibo.php/Cron/auto_search_weibo_for_self