A brief analysis of crontab task scheduling in Linux

1. Create a scheduling task

instruction

crontab -e enters the current user editing interface

crontab -u username-e Enter the specified user editing interface

Enter the crontab task editing interface

Task writing format

#Check the /ect directory once every minute and write the directory contents to /tml/a.txt

*/ 1 * * * * ll /etc >> /tmp/a.text

#crontab object + instructions

#Execute multiple tasks simultaneously
#crontab object command 1 & command 2

crontab object parameters

The first * indicates the minute range 0-59

The second * indicates the hour range: 0-23

The third * indicates the day. Range: 1-31

The fourth * indicates the month. Range: 1-12

The fifth * indicates the day of the week: 0-7 (0 and 7 both mean weekends)

The meaning of special symbols in crontab objects

* Any time

, represents multiple time points, such as 1,2 * * * * means that the command will be executed at 1:00 and 2:00 every day

- represents a closed interval between the time

*/N represents how often it is executed

2. View tasks

crontab -l View the tasks under the current user

crontab -u username -l View the tasks under the specified user

3. Delete tasks

crontab -r deletes tasks under the current user

crontab -u username -r deletes the tasks under the specified user

Summarize

The above is what I introduced to you about crontab task scheduling in Linux. I hope it will be helpful to you. If you have any questions, please leave me a message and I will reply to you in time. I would also like to thank everyone for their support of the 123WORDPRESS.COM website!
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