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This article is about Linux using crontabs to add timed tasks. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

preface

Linux systems are controlled by crond, a system service. Linux has a lot of planning work on it, so this system service is started by default.

The crontab command is used to set instructions that are executed periodically. This command reads instructions from standard input devices and stores them in a "crontab" file for later reading and execution.

We can see the status of crond service:

From this you can see that the crond service is enabled and active

In addition, because users can also set scheduled tasks themselves, Linux systems also provide user control of scheduled tasks command:crontab command.

crontab

Function: add, query, delete instructions for system scheduled tasks.

[root@localhost ~]# crontab

Options:

-e: Edit crontab timed tasks

-l: query crontab task

-r: Delete all crontab tasks for the current user 12345

[root@localhost ~]# crontab -e#Enter crontab editing interface. vim will open to edit your work #Enter data in the basic format:* ** * command12345

1. Format explanation:

Examples:

2. special format

example

3. Import and export from files to files

#import [root@localhost ~]# crontab filename#export [root@localhost ~]# crontab -l >filename1234

Examples:

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