CentOS Linux 排程操作

單次排程使用 at
ex. 如果在 2020/4/1 上午3點需關機，#後方為說明 $為命令提示字元
$ at  03:00 2020-04-01
> sync && sync && shutdown -h now
>                           #按下Ctrl+D

可用指令 atq 查詢，清單前方為排程序號
若有錯誤，可用指令 atrm 接序號清除
$ atrm 2


重複排程用cron (每年都做)
ex 重複申請 Letsencrypt，利用指令crontab編輯
$ crontab -e

0       12        0           0         0  certbot renew    #空白單格即可，此為了說明才多空白
-----------------------------------------
|          |          |           |            |
min  hour   day     month    day
                 of the month      of the week


參考資料
https://en.wikipedia.org/wiki/Cron

https://en.wikipedia.org/wiki/At_(command)


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