Ubuntu Crontab 設定方式

方式:     https://help.ubuntu.com/community/CronHowto

直接下指令

crontab -e

或是

sudo crontab -e

在裡面編輯

Cron also offers some special strings:

• string	meaning
  @reboot	Run once, at startup.
  @yearly	Run once a year, "0 0 1 1 *".
  @annually	(same as @yearly)
  @monthly	Run once a month, "0 0 1 * *".
  @weekly	Run once a week, "0 0 * * 0".
  @daily	Run once a day, "0 0 * * *".
  @midnight	(same as @daily)
  @hourly	Run once an hour, "0 * * * *".

minute (0-59), hour (0-23, 0 = midnight), day (1-31), month (1-12), weekday (0-6, 0 = Sunday), command

01 04 1 1 1 /usr/bin/somedirectory/somecommand