????1 crontab?????????
????1.1??????
????/sbin/service crond status ???????????????????
??????????start ???????
????Stop ??????
????Restart ???????????
????Reload ????????????
????1.2???????
????Crontab????????洢??cron.allow?????cron.deny????С?
????Cron.allow????洢??????????Щ??????crontab
????Cron.deny????洢???????????Щ??????crontab
???????????
??????1??????????????????????????????root??????crontab
??????2????cron.allow??????????cron.deny????????????????????cron.allow????е???????crontab
??????3????cron.deny??????????cron.allow??????????????????????????cron.deny????е?????????????crontab
??????4?????????????????????????????????????ж??У??????cron.allow????е???????cron.allow??????и???????????????????crontab
????1.3???????
????????crontab  –e ????????????????
????1.3.1????????
??????????? :
????*????*????*????*????*????command
???????????????????????
??????1?б??????00??59 ???????*???? */1???
??????2?б??С?00??23??0???0??
??????3?б??????01??31
??????4?б???·?01??12
??????5?б????????0??6??0?????????
??????6??????е?????
????crontab??????Щ?????
????30 21 * * * /usr/local/etc/rc.d/lighttpd restart
???????????????????21:30????apache??
????45 4 1??10??22 * * /usr/local/etc/rc.d/lighttpd restart
??????????????????1??10??22???4 : 45????apache??
????10 1 * * 6??0 /usr/local/etc/rc.d/lighttpd restart
???????????????????????????1 : 10????apache??
????0??30 18-23 * * * /usr/local/etc/rc.d/lighttpd restart
????????????????????18 : 00??23 : 00??????30????????apache??
????0 23 * * 6 /usr/local/etc/rc.d/lighttpd restart
????????????????????????11 : 00 pm????apache??
????* */1 * * * /usr/local/etc/rc.d/lighttpd restart
??????С?????apache
????* 23-7/1 * * * /usr/local/etc/rc.d/lighttpd restart
????????11??????7?????????С?????apache
????0 11 4 * mon-wed /usr/local/etc/rc.d/lighttpd restart
??????μ?4????????????????11??????apache
????0 4 1 jan * /usr/local/etc/rc.d/lighttpd restart