Permission
User Managerment
Account /etc/passwd Linux uses the /etc/passwd file to store user account information. Because m...
Group Management
Relationship Primary Group When a user is created, a group with the same name is also created, w...
File Permission
Composition Structure -rwxr-xr-- The first character indicates the file type: -：File, such as ...
Acess Control List
Access Control List (ACL) is a more flexible and fine-grained permission management mechanism, us...