CentOS timed start and purge tasks

Because of the need to perform tasks on a timed basis, we found the Crontab tool and introduced its usage:

Shell=/bin/bash  path=/sbin:/bin:/usr/sbin:/usr/bin  mailto=root  home=/  # run-parts  01 * * * * Root run-parts/etc/cron.hourly  4 * * * Root run-parts/etc/cron.daily  4 * * 0 root Run-parts/etc/cron.week LY  4 1 * * Root run-parts/etc/cron.monthly  

   
The second paragraph should be defined as: hours, expressed from the first hours of execution, the range is from the 0-23 third paragraph should be defined is: date, expressed from the day of the month, the scope of the fourth paragraph should be defined is: The month, the first month of the year to execute, the scope from the fifth paragraph should be defined is: weeks, Represents the day ordinal of a week, ranging from 0-6, where 0 represents Sunday. Every six paragraphs should be defined: the user name, that is, the execution of the program to be executed by which user, this can generally be omitted; The seventh paragraph should be defined as: command and arguments executed.

Method One:

Set up server timed boot

Vim/etc/crontab

#reboot set to restart 10:30 every day * * * *  Root/sbin/reboot  

Reload Configuration

/sbin/service Crond Reload

Restart Cron

/sbin/service Crond Restart

　

Method Two:

Execute directly at the command line

[[email protected] ~]# CRONTAB-E Add timing

*/10 17-18 * * * root tcpdump-i eth0 TCP port 80-s 0-w sohu1.txt

*/10 17-18 * * * root tcpdump-i eth0 TCP port 80-s 0-w sohu1.cap

Wq exit

[[email protected] ~]# Crontab-r Delete Task

[[email protected] ~]# crontab-l display tasks

For example, Tcpdump is still running in the background, you can use Killall tcpdump

CentOS timed start and purge tasks