RedHat Basic

Hello everyone today we are going to study about Redhat. In this post we are telling you about basic knowledge of Redhat.

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	KDE
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@rameshchahar ~]#

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	N
[root@rameshchahar ~]#	[uesr@rameshchahar ~]$

For Example- Admin control all users.

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4. Basic Command

Open Terminal and run command-

[root@rameshchaha ~]# whoami

Command Description

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