Common Linux commands (entering and exiting the system)

Common Linux commands (entering and exiting the system)-General Linux technology-Linux technology and application information. For more information, see the following. Go to Linux:
You must enter your account. You can create the following two accounts during system installation:
1. root-Super User Account (System Administrator), which can be used to do anything in the system.
2. Common users-this account is used by common users and can perform limited operations.
Generally, Linux users are common users, while System Administrators generally use superuser accounts to perform system management. If you only need to complete some tasks that can be completed by a common account, we recommend that you do not use a Super User Account to avoid accidental damage to the system. Affects the normal operation of the system.
User logon is divided into two steps: Step 1: Enter the user's login name, and the system recognizes the user based on the login name; Step 2: Enter the user's password, which is a string set by the user, other users are kept confidential and keywords used by the system to identify authentic and false users during logon.
After you enter the user name and password correctly, you can access the system legally. Screen Display:
[Root @ loclhost/root] #

Then you can perform various operations on the system. Note that the Super User prompt is "#", and the other user prompt is "$ ".

Change Password
To better protect the security of your account, Linux allows you to change your password at any time. The command used to change the password is passwd, which will prompt you to enter the old password and new password, then, the user is asked to confirm the new password again to prevent the user from accidentally pressing the wrong key. If you forget the password, you can apply to the system administrator to reset the password.

Virtual console
Linux is a real multi-user operating system that allows multiple users to log on at the same time. Linux also allows a user to log on multiple times, because like Linux and UNIX, the virtual console access mode is provided, allowing users to log on multiple times from the console at the same time. The choice of the virtual console can be achieved by pressing the Alt key and a function key, usually using the F1-F6 For example, after the user login, click the Alt-F2 key, the user can see "login:" prompt, the user sees the second virtual console. Then you just press the Alt-F1 key to go back to the first virtual console. By default, a newly installed Linux system allows users to access the first six virtual consoles with the Alt-F1-to-Alt-F6 key. The virtual console allows users to work on multiple consoles at the same time, truly reflecting the characteristics of multiple users in the Linux system. You can switch to another virtual console to start another job when the work on a virtual console has not been completed.

Exit System
If you want to exit the system as a super user or a common user, enter the exit command at the shell prompt.