Linux timed Tasks

Crond Scheduled Tasks

First scheduled task second level

vi/root/miao.sh

#! /bin/sh

While True

Do

echo Weixiwen Babaxiangni >>/tmp/a.log placed in A.log to execute

Sleep 1

Done

then sh miao.sh & represents the background execution Ps-aux |grep Miao with Tail-f/tmp/a.log with kill The process number closes the scheduled task that is performed in the background.

1. system Scheduled Tasks

Ll/var/log/messages* ,ll/var/log/sercure* and many more.

/ETC/LOGROTATE.D is a tool for system log management and is managed by any timing

Configure the System cron in the /etc/logrotate.conf .

The timing task of the system is configured in the/etc/cron* the user performs the scheduled tasks to distinguish not to create in the system

User timed Tasks View crontab-l

2, a scheduled task at the time, the work is generally not used in the sudden task, relying on ATD.

3, Anacron use non- 7x24 hours to boot the server, boot execution, the meaning is not big, working in the server year-round boot.

4, Crond default per minute of work commonly used. Using Crond is a timed task daemon, and the Crondtab command is a command used to set up timed task rules.

Crontab–e actually edited is /var/spool/cron/root control /etc/cron.deny/etc/cron.allow generally no tube The main view of the user's own permissions

the first five columns of the time- sharing week 6 column scheduled task rules If you arrive in the hour, the maximum is the day. If the day is up to the moon. Just say the last floor is enough. Timed any no port number

do not use both week and day because the number 3 per week may not be the same .

Linux timed Tasks