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Linux, Tools

Crontab Generator

2021年4月25日

If you want to periodically perform a task (e.g. sending Emails, backing up database, doing regular maintenance, etc.) at specified times and dates, there are two ways to set scheduled tasks:

Method 1: Use our online cron job service that will save you a headache.
Method 2: Use Cron available in Unix/Linux systems.

If you go with method 2, the following generator can help you produce a crontab syntax that you can copy & paste to your crontab file (You can open the file by using command crontab –e). Below the generated crontab syntax, a list of run times will be displayed too. The predictions will help you ensure that you set the time and date right.

link：https://crontab-generator.org/

Linux

Centos8 Scheduled Task Plan crontab

2021年4月16日

Crontab task plans are used to execute programs periodically.
1) View crontab services

systemctl status crond

2) 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 script

3) View cron task plan

crontab -l

4) Edit cron task plan

crontab -e

5) Delete all cron task schedules

crontab -r

Author:https://blog.csdn.net/richardfjf/article/details/106786772