"Linux" crontab every 1 hours and 2 hours to execute the job

Crontab-l

Crontab-e

Execute */5 every five minutes * * * *

Executes 0 per hour * * * *

Execute 0 */2 per 2 hours * * *

Executes 0 0 * * * per day

Weekly Execution 0 0 * 0

Monthly execution 0 0 1 * *

Annual Execution 0 0 1 1 *

Asterisk (*): represents all possible values, such as the month field if it is an asterisk, the command action is executed monthly after the constraints of other fields are met.

Comma (,): You can specify a list range with a comma-separated value, for example, "1,2,5,7,8,9"

Middle Bar (-): An integer range can be represented by a middle bar between integers, such as "2-6" for "2,3,4,5,6"

Forward slash (/): You can specify the interval frequency of the time with a forward slash, such as "0-23/2", which is performed every two hours. A forward slash can be used with asterisks, such as */10, if used in the minute field, which means that it executes every 10 minutes.

Working with instances

Example 1: command is executed every 1 minutes

Command:

* * * * * command

Example 2:3rd and 15 minutes per hour of execution

Command:

3,15 * * * command

Example 3: Execution at 3rd and 15 minutes from 8 o'clock in the morning to 11.

Command:

3,15 8-11 * * command

Example 4:3rd and 15 minutes of every two-day 8 o'clock in the morning to 11-point execution

Command:

3,15 8-11 */2 * command

Example 5:3rd and 15 minutes of each Monday from 8 o'clock in the morning to 11.

Command:

3,15 8-11 * * 1 command

Example 6:21:30 restart of SMB per night

Command:

* * * * */ETC/INIT.D/SMB restart

Example 7:4:45 restart SMB per month for 1, 10, 22nd

Command:

4 1,10,22 * */ETC/INIT.D/SMB restart

Example 8:1:10 restart SMB per Saturday, Sunday

Command:

1 * * 6,0/ETC/INIT.D/SMB restart

Example 9: Restart SMB every 30 minutes from 18:00 to 23:00 daily

Command:

0,30 18-23 * * */ETC/INIT.D/SMB restart

Example 10: Every Saturday night at 11:00am restart SMB

Command:

0 * * 6/ETC/INIT.D/SMB restart

Example 11: Restart SMB every hour

Command:

* */1 * * * */ETC/INIT.D/SMB restart

Example 12: Restart SMB every hour from 11 o'clock to 7 in the morning

Command:

* 23-7/1 * * * */ETC/INIT.D/SMB restart

Example 13:4th per month with 11 points per Monday to Wednesday restart SMB

Command:

0 4 * MON-WED/ETC/INIT.D/SMB restart

Example 14:4-point restart of SMB on January 1

Command:

0 4 1 Jan */ETC/INIT.D/SMB restart

Example 15: Execution of scripts within/etc/cron.hourly directory per hour

Command:

* * * * * Root run-parts/etc/cron.hourly

Description

Run-parts This parameter, if you remove this parameter, you can write a script name to run, not the directory name.

"Linux" crontab every 1 hours and 2 hours to execute the job