User and Rights Management for Linux file systems

1. Why should I have the concept of a user?

Multi-user, multi-tasking business needs to isolate system resources

2. What are the categories of Linux users?

　　2.1 . Administrator user has permission to manipulate all files 2.2 The system user is also known as the back-end user, in order to enable those background processes or service processes to run as a non-administrator, usually need to create a number of ordinary users, such users never log on to the system
　　2.3. General users

3. How to isolate the system resources?

　　3.1 . Authentication: Authentication user has permission to login system  3.2. Authorization: Authorizing users to read, modify, and perform actions on a file/folder are authorized

User and Rights Management for Linux file systems