systemctl

# systemctl                #输出已激活单元

# systemctl list-units        #输出已激活单元

# systemctl --failed            #输出运行失败的单元

# systemctl list-unit-files        #查看所有已安装服务

# systemctl start nginx        #启动nginx

# systemctl stop nginx        #停止nginx

# systemctl restart nginx        #重启nginx

# systemctl reload nginx        #重新加载nginx配置

# systemctl status nginx        #输出nginx运行状态

# systemctl is-enabled nginx    #检查nginx是否配置为自动启动

# systemctl enable nginx        #开机自动启动nginx

# systemctl disable nginx        #取消开机自动启动nginx

# systemctl help nginx        #显示nginx的手册页

# systemctl daemon-reload        #重新载入 systemd，扫描新的或有变动的单元

# systemctl reboot            #重启

# systemctl poweroff            #退出系统并停止电源

# systemctl suspend            #待机

# systemctl hibernate        #休眠

# systemctl hybrid-sleep        #混合休眠模式（同时休眠到硬盘并待机

# systemctl isolate graphical.target    #等价于telinit 3 或 telinit 5