How to use user and user Group commands in linux
Users and user groups for linux
Is the user a must?
User: identify the home password of the resource on the computer: verify the identity of the user
How does the computer authenticate when logging in?
There is a database in advance inside the computer, and the user name and corresponding password are saved in the database. When the user logs in, the user checks the database to see if the user and password are correct.
What is a database?
A file used to save data, database management software (oracle mysql sqlserver db2)
Save the database file of account and password
/ etc/passwd
