crontab -e

# For details see man 4 crontabs
 
# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name  command to be executed
 
#每60分種執行
# */60 * * * * root /root/java/test1.sh
#每天1點20分 執行
# 20 1 * * * root /root/java/test2.sh
#文件最後一定要留一個空行，不然命名：crontab /etc/crontab會報錯

重啓服務：

sudo systemctl restart crond.service 

查看任務

crontab -l

查看日誌：

tailf /var/log/cron