Linux entry and exit system

Into the Linux system:
Enter the user account must be in the system installation process can create the following two accounts:
1. root - super user account (system administrator), use this account can do anything in the system.
2. Ordinary users - that account for ordinary users, the operation can be limited.
Linux users in general are ordinary users, system administrators generally use super-user account to complete some administrative work. If you only need to complete some of the general account will be able to accomplish, it is recommended not to use super user account, so as not to inadvertently damage the system. Affect the normal operation of the system.
User log in two steps: first, enter the user's login name, the system recognizes the user under the login name; the second step, enter the user's password, the password is user set a string of other users is confidential when the system is used in the login user's keywords to distinguish between true and false.
When the user correctly enter a user name and password, the system will be able to legally enter. Screen Display:
[Root @ loclhost / root] #

Then you can do various operations on the system has. Note that super-user prompt is "#", other users of the prompt is "$."

Modify password
In order to better protect the security of user account, Linux allows users to modify their own password at any time, modify the password of the command is passwd, it will prompt the user to enter the old password and new password, and then also require the user to confirm the new password again to avoid user intention press the wrong button. If the user forget the password, you can apply to the system administrator to re-set for themselves a.

Virtual Console
Linux is a true multi-user operating system, it can also accept multiple users log on. Linux also allows a user to repeatedly log on, because, like Linux and UNIX, providing a virtual console access method that allows users at one time several times from the console log. Virtual Console could be selected by pressing the Alt key and a function key to achieve, often using F1-F6, for example, users log in, click Alt-F2 keys, users can also see the "login:" prompt, the user see the second virtual console. Then just press Alt-F1 key, you can return to the first virtual console. A newly installed Linux system default allows the user to use Alt-F1 to Alt-F6 key to access the first six virtual consoles. Virtual Console allows users to work simultaneously on multiple consoles, truly reflect the characteristics of multi-user Linux systems. Users can conduct a virtual console before the end of the work, switch to another virtual console start another job.

Exit System
Whether super-user, or the ordinary user, need to exit system, in the shell prompt, type exit command can be.