Linux System Scheduled Tasks

Linux System Scheduled Tasks

/etc/crontab Cron master configuration file, you can define path

The cron format is as follows:

#.----------------minutes (0-59)

# | .-------------hours (0-23)

# |  | .----------Day (1-31)

# |  |  | .-------Month (1-12)

# |  |  |  | .----Week (0-6) (Sunday =0 or 7)

# |  |  |  | |

# * * * * * * user-name command to be executed

Cron is also a service, so you need to start the service to be effective: service Crond start; Service Crond Status

crontab-e : Writing task opportunities, similar to using VIM to open the crontab configuration file

crontab-l: View the Scheduled Tasks

crontab-r: Deleting Scheduled Tasks

Check if the Crond service has been started

Service Crond Status

[[Email protected] ~]# service Crond Statuscrond (PID 1072) is running ...

Start the Crnod service

Service Crnod Star

Task Schedule Exercises:

Clear/var/log/slow.log This file every 1:20 A.M.

Execute "/bin/sh/usr/local/sbin/backup.sh" every Sunday 3 o'clock

14th # 4:10 per month to execute "/bin/sh/usr/local/sbin/backup_month.sh"

Perform "Ntpdate time.windows.com" every 8 hours

1 points per day, 12 points, 18 points to execute "/bin/sh/usr/local/sbin/test.sh"

"/bin/sh/usr/local/sbin/test2.sh" is executed from 9 to 18 every day.

Crontab-e into the editing mode, write the content, and then quit saving, it is necessary to note that the format must be written to, or can not be saved, will be error

1 * * * echo "0" >/var/log/slow.log

0 3 * * 0/bin/sh/usr/local/sbin/backup.sh

4 * */bin/sh/usr/local/sbin/backup_month.sh

0 */8 * * * ntpdate time.windows.com

0 1,12,18 * * */bin/sh/usr/local/sbin/test.sh

0 9-18 * * */bin/sh/usr/local/sbin/test2.sh

This article is from the It Exchange Learning blog, so be sure to keep this source http://sxct168.blog.51cto.com/824373/1659673

Linux System Scheduled Tasks