Linux users and user groups, UID and GID

The following articles are listed:

If you view the UID and gid:http://blog.csdn.net/ahangliu/article/details/7567444 of the user under the Linux system

User and user group management for Linux: http://www.cnblogs.com/end/archive/2011/05/25/2057129.html

Talking about the concept of Linux user and user group: http://linuxme.blog.51cto.com/1850814/347086/

Linux Add/Remove users and user groups: Http://www.cnblogs.com/xd502djj/archive/2011/11/23/2260094.html

Linux users and user groups, UID and GID