????5????????
???????1???1??????????command
????????
????* * * * * command
???????2???С????3???15???????
????????
????3??15 * * * * command
???????3????????8??11????3???15???????
????????
????3??15 8-11 * * * command
???????4??????????????8??11????3???15???????
????????
????3??15 8-11 */2 * * command
???????5????????????????8??11????3???15???????
????????
????3??15 8-11 * * 1 command
???????6??????21:30????smb
????????
????30 21 * * * /etc/init.d/smb restart
???????7?????1??10??22???4 : 45????smb
????????
????45 4 1??10??22 * * /etc/init.d/smb restart
???????8??????????????1 : 10????smb
????????
????10 1 * * 6??0 /etc/init.d/smb restart
???????9?????18 : 00??23 : 00??????30????????smb
????????
????0??30 18-23 * * * /etc/init.d/smb restart
???????10???????????????11 : 00 pm????smb
????????
????0 23 * * 6 /etc/init.d/smb restart
???????11????С?????smb
????????
????* */1 * * * /etc/init.d/smb restart
???????12??????11??????7?????????С?????smb
????????
????* 23-7/1 * * * /etc/init.d/smb restart
???????13????μ?4????????????????11??????smb
????????
????0 11 4 * mon-wed /etc/init.d/smb restart
???????14?????????4??????smb
????????
????0 4 1 jan * /etc/init.d/smb restart
???????15???С????/etc/cron.hourly???????
????????
????01   *   *   *   *     root run-parts /etc/cron.hourly
?????????
????run-parts???????????????????????????????????д????е???????????????????????
?????????????????
????1. ?????????????
???????????????????crontab??????????????????????У??????????????????????????????????????????crontab?????????????????????????
??????crontab????ж??????????????????????????????????????????????????????????????????????????????shell????????е???????????????????????????????????????????????????κλ???????????????????crontab????????????????????????л??????????????????????????????????????
??????????cron????????????????????????????????????????????shelll??????????б????·??????????????????Щ???????????????????????????3??
????1????????漰???·???д???·????
????2????????????java????????????????????source?????????????????磺
????cat start_cbp.sh
????#!/bin/sh
????source /etc/profile
????export RUN_CONF=/home/d139/conf/platform/cbp/cbp_jboss.conf
????/usr/local/jboss-4.0.5/bin/run.sh -c mev &
????3?????????н??OK??????crontab????????????????????????????????????????????????crontab???????????????????????磺
????0 * * * * . /etc/profile;/bin/sh /var/www/java/audit_no_count/bin/restart_audit.sh
????2. ????????????????????
??????????????????????????????????????????????????????????????????????????????????????????????????????????????У???????????????????????????????
???????磬??????crontab??????????????????????????????
????0 */3 * * * /usr/local/apache2/apachectl restart >/dev/null 2>&1
????“/dev/null 2>&1”?????????????????/dev/null????????????????????????????????????????????/dev/null???????????????????/dev/null?????????????????????
????3. ?????????????????????????
??????????????????????????Щ?????????????????????????????????????Щ????????????????????????????????????????????????????????????????????У?root??????????????????????“crontab –uroot –e”????????????????????????д??/etc/crontab???????????????????????????????????????????????????/etc/crontab??????????root????′??????????????????????????Ч???
????4. ???????????
?????′?????cron job????????????У????????2???????С????????cron????????С?
??????crontab???Ч??????????/etc/init.d/crond restart????????????????????job????????/????tail -f /var/log/cron??
??????????????crontab -r??????Crontab????/var/spool/cron????????????Crontab????????????????????crontab??????
??????crontab??%??????????????????е????????????????????????\%???羭?????date ‘+%Y%m%d’??crontab?????????е????????date ‘+\%Y\%m\%d’??