Linux01-目录结构

https://cloud.tencent.com/developer/article/1678497?from=15425

http://www.360doc.com/content/14/0607/16/203871_384577619.shtml">http://www.360doc.com/content/14/0607/16/203871_384577619.shtml

https://www.cnblogs.com/silence-hust/p/4319415.html

https://www.itcast.cn/news/20190402/10223383178.shtml

https://blog.csdn.net/baidu_38661691/article/details/97147652

一、etc目录

存放一些杂七杂八的配置文件
https://www.cnblogs.com/wjchao/p/7384432.html

etc/profile

全局环境变量
https://www.linuxidc.com/Linux/2010-08/27742.htm

etc/sudoers

https://www.jb51.net/article/113902.htm

http://blog.sina.com.cn/s/blog_66f117f60102w86m.html

建议使用visudo指令来编辑/etc/sudoers文件，退出时会有语法检测。

• visudo： /etc/sudoers 忙，请稍后重试解决办法:
  https://www.cnblogs.com/MoonASixpence/p/14967895.html

• 设置普通用户到root组，执行sudo也没有权限：
  https://www.cnblogs.com/dunitian/p/6667711.html
  需要编辑 /etc/sudoers,将普通用户配置进去。