linux视频教程：尚观
http://www.uplinux.com/shipin/linuxyong-hu-guan-li-zhi-yong-hu-guan-li-01
一，linux开机（centos7）出现出现 license information(license not accepted)解决办法 ： https://blog.csdn.net/majishushu/article/details/54142180
二，top命令详解 : https://blog.csdn.net/bbirdsky/article/details/52085633