1. Linux Basic
Login Screen-
1. two types of login screens:
virtual console
graphical login (called display manager)
2. login using login name and password
3. each user has a home directory for personal file storage.
Switching between virtual console and graphical environment-
1. A linux system will run six virtual consoles and one graphical console.
2. server system often have only virtual consoles
 3. desktop system and workstation typically have both.
4. switch among virtual consoles by pressing:Ctrl+Alt+F[1-6]
5. access the graphical console by pressing Ctrl+Alt+F7
Elements of the X Window System- 
1. the X Window System is Linux graphical subsystem
2. Xorg is the particular version of the X Window System used by Red Hat.
3. look and behavior largely controlled by the desktop environment
4. two desktop environment provided by Red Hat:-
 GNOME (GNU Network Object Model Environment )
  KDE (K desktop Environment)
Difference Between Gnome and KDE Desktop-

Gnome IMO is better looking. All it is is just a different desk top environment.
KDE is lighter on resources but looks a bit more like that "Other" operating system.

Note- Basically Linux Server Uses Virtual Console.

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2. Virtual Console
A virtual console (VC) – also known as a virtual terminal (VT) – is a conceptual combination of the keyboard and display for a computer user interface. It is a feature of some operating systems such as BSD, Linux, and UnixWare in which the system console of the computer can be used to switch between multiple virtual consoles to access unrelated user interfaces. Virtual consoles date back at least to Xenix in the 1980s.

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3. The root user

1. the root user a special administrative account
2. also called superuser
3. root has near complete control over the system
4. and a nearly unlimited capacity to damage it.
5. do not login as root unless necessary
6. normal users potential to do damage is more limited.

[root@localhost ~]#

Difference between a normal user and a root user in Linux?

Root User
Normal User
A "root" user has the power to do anything on a Linux system.
A normal user can only gain root access with sudo if they are in the sudoers file
Control all over system
[root@localhost ~]#
[uesr@localhost ~]$

For Example- Admin control all users.

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4. Basic Command

Open Terminal and run command-
[root@localhost ~]# whoami

Command Description
Tells the user who they are acting as; usually their own username.
Lists currently logged on users username, port, and when they logged in
This program shows a lot of stuff that goes on with your system. In the
Prints the current working directory
Lists all current running processes, their corresponding pids, and their status
Lists all information on all files
This will display the status of the currently defined interface (.e.g #ifconfig eth0)
Get or set hostname
This will clear your screen
Changes directories (.e.g #cd /home/dsoneil )
This will create new directory (.e.g. #mkdir dirname )
Create file (.e.g. #cat > filename ) create
(.e.g. #cat < filename ) open
Copy File (.e.g. #cp file1 /root/Desssktop )
Remove File (.e.g. #rm file1 )
This will allow you to access the Superuser privileges. Type exit to revert back to normal (.e.g. #su user1 )
display calendar                                                   
Display date

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