Linux Study session eight week (March 26)

10.23 Linux Task Scheduler cron

Executes the command 3 o'clock in the morning every day and the task is scheduled to #crontab-e

0 3 * * */bin/bash/usr/local/sbin/123.sh >>/tmp/123.log 2>>/tmp/123.log

Every Monday, five of the even-numbered months of 1-5-day 3 o'clock in the morning executes the command, or #crontab-e

0 3 1-5 */2 1,3,5 /bin/bash/usr/local/sbin/123.sh>>/tmp/123.log 2>>/tmp/123. Log

Start Task Scheduler, #systemctl start Crond

See if it's running, #ps aux | grep cron or #systemctl status Crond

Stop running, #systemctl stop Crond

View specific task schedules, #crontab-l

-R Delete Task schedule, #crontab-R

-u Specify user, #crontab-u root

10.24 Chkconfig Tools

Boot Start Item

System service Directory is/ETC/INIT.D

Add service, Chkconfig--add Network

Delete Service, Chkconfig--del Network

Boot up, chkconfig--level 3 Network on

Boot does not start, chkconfig--level 345 network off

System services, 7 levels, 0-level shutdown, 1-level rescue mode, 234 for multi-user mode, 5 for graphical interface, 6 for restart;

10.25 SYSTEMD Management Services

Systemctl list-units--all--type=service lists all types of service;

10.26 Unit Introduction

10.27 Target Introduction

Extended

1. Anacron http://blog.csdn.net/strikers1982/article/details/4787226

2. XINETD (the default machine does not install this service, requires Yum install xinetd installation) http://blog.sina.com.cn/s/blog_465bbe6b010000vi.html

3. SYSTEMD Custom Startup script http://www.jb51.net/article/100457.htm

Linux Study session eight week (March 26)