Linux Crond Task Scheduler

Task Scheduler Main program:

1. ATD production environment is not commonly used

2. Anacron production environment is not commonly used

3. Crond commonly used, mainly introduce this program

Crond Service (daemon name Crond, always running):

Command:

Crontab parameters

Common Parameters Introduction:

-e Edit User Task schedule

-L View user's current task schedule

-u user view a user task schedule

Task Scheduler configuration file path:/var/spool/cron/

Under the root User:

Crondtab-e equals Vi/var/spool/cron/root.

Crondtab-l equals Cat/var/spool/cron/root.

Task Scheduler configuration file format:

* * * * Command ( Absolute path recommended for commands, files or directories )

Asterisk	Meaning	Range of values
1th asterisk *	Representative minutes	00-59 (00 can also 0)
2nd asterisk *	Representative hours	00-23
3rd asterisk *	Representative Day	01-31
4th asterisk *	Representative month	01-12
5th asterisk *	Representative of the Week	0-6 (0 for Sunday)

* per

-range, such as: 00 17-19 * * *

, separated, such as: 00 17,20,22 * * * Daily 17 o'clock, 20 points and 22 points

/n per unit time, nth number, such as: */10 * * * * * every 10 minutes

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Linux Crond Task Scheduler