Crontab task plans are used to execute programs periodically.
1) View crontab services
systemctl status crond2) Task plan format
*(minute) * (hour) * (day) * (month) * (week) cycle execution procedure
#The longest is every year, the shortest is every minute
30 22 * * 6 time.sh
#Every Saturday at 22:30 PM time.sh script
30 22 * * 1,3,5 time.sh
#Every Monday, Wednesday and Friday at 22:30 PM time.sh script
30 22 * * 1-5 time.sh
#Every week from Monday to Friday at 22:30 PM time.sh script
* * * * * time.sh
#Every minute time.sh script
*/5 * * * * time.sh
#Every 5 minutes time.sh script
00 00 * * * time.sh
#Every night at 0:00 p.m time.sh script3) View cron task plan
crontab -l4) Edit cron task plan
crontab -e5) Delete all cron task schedules
crontab -rAuthor:https://blog.csdn.net/richardfjf/article/details/106786772