10.23 Linux Task Scheduler cron 10.24 chkconfig Tools 10.25 System

10.23 Linux Task Scheduler cron

Command parameters for Crontab
-u specifies a user, without-u, refers to the current user
-e indicates a task plan, similar to the use of vim
-l lists the current task schedule
-R Delete Task schedule

10.24 Chkconfig Tools

10.25 SYSTEMD Management Services

10.26 Unit Introduction

10.27 Target Introduction
Relationships between service, unit, and target
1. A service is part of a unit
2. Multiple unit together to form a target
3. A target contains multiple service, you can view the contents of the [Install] section of the file/usr/lib/systemd/system/sshd.service, it defines which target the service belongs to.

10.23 Linux Task Scheduler cron 10.24 chkconfig Tools 10.25 System