CentOS Login, Logout and Shutdown

Login and Logout via Terminal User Interface Mode (TUI)

LOGIN

Just imagine that TUI mode is the DOS mode you use to login to Linux server. The benefit of using TUI was discuss earlier in last module.

In the following example, we login using user Jane account. The window session we are working on is call shell. If the system can successfully verify the login id and password, the login is permitted.

The above screen capture : Last login: Sat Nov 28 05:32:44 2009 from 192.168.1.3 means I was login previously from ip 192.168.1.3.

what is [jane@srv1 ~]$ means?

 

jane	the user name/ user id you login to Linux server
srv1	this is the Linux server name (hostname)
~	this is user's home directory (like MS Windows 7, C:\Users\Jane)
$	this $ symbol tells you are in normal user mode

You will notice that I issue 3 Linux command here

pwd	this command tell us in which directory we are current in. In above example, we know that /home/jane means, we are in jane's directory which is the subfolder of /home directory.
whoami	this command tell you user id that you login in.
id -un	same as whoami command, also tell you your username/userid

So, if I need to work under root privilege, should I logout user account jane and login as root? the answer is NO. you can issue the following command.

 

[jane@srv1 ~]$ su - root Password: [root@srv1 ~]# pwd /root [root@srv1 ~]# whoami root

You might interested to see also the differences with su and su - command.

LOGOUT

There are two commands to logout from the Linux system.

 

[root@srv1 ~]# logout [root@srv1 ~]#exit

However, there are some differences, as for beginners we just consider both command are the same as this moment.

logout	This will logout the user from the login shell.
exit	This command is to end a shell session

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