????crontab?????????????????????????????????е???????windows?μ???????????????????????????????????????????????????crond?????crond??????????????????????е?????????????е????????????и?????
???????
????crontab??С????1?????
????????
????crontab(???)(????)
???????
????-e????????????????????
????-l???г?????????????????
????-r?????????????????????
????-u<???????>???????趨???????????????
??????????
????crontab??????????????????????crontab?????
???????????
????Linux?μ??????????????????????????????????? ???????????????????????е??????????д????????????????????????/etc?????????crontab?????????????????????????????
????/etc/crontab??????????漸?У?
????SHELL=/bin/bash
????PATH=/sbin:/bin:/usr/sbin:/usr/bin
????MAILTO=""HOME=/
????# run-parts
????51 * * * * root run-parts /etc/cron.hourly
????24 7 * * * root run-parts /etc/cron.daily
????22 4 * * 0 root run-parts /etc/cron.weekly
????42 4 1 * * root run-parts /etc/cron.monthly
???????????????????crond???????е???????????????SHELL??????????????????shell????????bash???????PATH???????????????????·??????????MAILTO?????????crond?????????????????????????????root????????MAILTO???????????????????????????????????????????е?HOME?????????????????????????????????? ?????????????????????е??????????????????????????????????????????? crontab ?????????????????????????????????crontab?????????????/var/spool/cron???С?????????????????￡???????????????￡?
????/etc/cron.deny ???????????????????????crontab????
????/etc/cron.allow ?????????????????????crontab????
????/var/spool/cron/ ???????crontab?????????????????????? crontab???????壺???????????crontab????У????ж??????????????е??????δ????????????????????????????Σ???????????趨?Σ????????????е?????Σ???????￡?
????minute hour day month week command ????? ? ?? ?? ??
???????У?
????minute?? ???????????????0??59?????κ???????
????hour?????С??????????0??23?????κ???????
????day?????????????????1??31?????κ???????
????month??????·?????????1??12?????κ???????
????week???????????????????0??7?????κ????????????0??7???????????
????command?????е?????????????????????????????д?????????
?????????????????У???????????????????????
????????*???????????п???????????month????????????????????????????ε????????????????и?????????? ????????????????????????????????б??Χ?????磬“1??2??5??7??8??9”
?????и??-???????????????????и????????????Χ??????“2-6”???“2??3??4??5??6” ??б???/????????????б???????????????????“0-23/2”??????С??????Ρ?????б????????????????????*/10?????????minute??Σ???????????????Ρ?crond????
????/sbin/service crond start //???????
????/sbin/service crond stop //??????
????/sbin/service crond restart //???????
????/sbin/service crond reload //????????????
??????crontab????????
????service crond status
??????????crontab????
????service crond start
??????crontab??????????????????????????????
????ntsysv
??????????????????
????chkconfig –level 35 crond on