平台：Ubuntu 16.04

命令： adduser

在root 用户下 执行命令

#adduser blog
password for xx:
Adding user `blog' ...
Adding new group `blog' (1001) ...
Adding new user `blog' (1001) with group `blog' ...
The home directory `/home/blog' already exists.  Not copying from `/etc/skel'.
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully
Changing the user information for blog
Enter the new value,or press ENTER for the default
        Full Name []: 
        Room Number []: 
        Work Phone []: 
        Home Phone []: 
        Other []: 
Is the information correct? [Y/n] Y

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给新用户添加权限
# vim /etc/sudoers
修改文件如下：
# User privilege specification
root ALL (ALL) ALL
blog ALL (ALL) ALL

修改的是 readonly file  所以在保存退出时 使用 wq!  命令