Analysis of crontab Task scheduling in Linux

one。 Create a scheduled task

Instruction

Crontab-e enters the current user editing interface

Crontab-u user name-e enters the specified user editing interface

Enter the crontab task editing interface

Task writing format

# check the / ect directory every minute and write the contents of the directory under / tml/a.txt

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

# crontab object + instruction

# perform multiple tasks at the same time

# crontab object instruction 1 & instruction 2

Crontab object parameters

The first * indicates a minute range of 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 range of days of the week: 0-7 (both 0 and 7 mean weekend)

The meaning of special symbols in crontab object

* means at any time

Represents multiple time points, such as 1 minute 2 * means 1 point and 2 points every day

-represents a closed interval of time.

* / N represents how often to execute

two。 View Task

Crontab-l view the tasks under the current user

Crontab-u user name-l View the tasks under the specified user

three。 Delete a task

Crontab-r deletes tasks under the current user

Crontab-u user name-r Delete tasks under the specified user

Summary

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