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systemctl 
daemon-reload: 重新加载某个服务的配置文件,如果新安装了一个服务,归属于 systemctl 
管理,要是新服务的服务程序配置文件生效,需重新加载。
 
init 和 systemd 的命令区别,大概简介:
 
 
systemctl --help  查看帮助!!!!!!!
 
systemctl  enable  |  disable |  is-enabled  | status  | is-active  unit
systemctl   get-default    |  set-default   graphical.target  
| multi-user.target           islate 在线切换模式  
systemctl reload-daemon  加载新的unit 配置文件  
systemd  的 unit 的配置文件位置  :  redhat 系列: 目录  /usr/lib/systemd/system/ 下 
enable 是在  /etc/systemd/system/multi-user.target.wants/  这个目录下 做 unit 配置文件的软链: