linux用户/root密码设置
https://blog.csdn.net/qq_28120227/article/details/100677167
https://blog.csdn.net/zhuxingchong/article/details/79461837
https://blog.csdn.net/qq_28120227/article/details/100677167
https://blog.csdn.net/zhuxingchong/article/details/79461837