命令 操作 systemctl reboot 重启机器 systemctl poweroff 关机 systemctl suspend 挂起-睡眠-保存在內存 systemctl hibernate 休眠-断电-保存在硬盘 systemctl hybrid-sleep 混合休眠模式（同时休眠到硬盘并挂起）
https://blog.csdn.net/le119126/article/details/50083855