Introduction to Linux

Linux operating system comes under the flavor of the Unix. Linux is the open source operating system. You have an access to the source code of this operating system that`s why it is known as open source operating system.

Linux provides the GUI (Graphical User Interface) as well as the CLI (Command Line Interface). Mostly the Linux is used with the CLI mode as it is more powerfull.
Linux operating system is very secure than the Windows operating system.  As Linux is secure it get used widely at the server side.
The Android operating system which is widely used for mobiles now a days is also based on the Linux. The kernel which is used in the Android is Linux based.

What is flavors in Linux?
Lets understand what is flavor. As we know Linux is open source that means anyone can customize the source code for their own purpose So, various organizations, companies or individuals hosted their flavor by various names.

Here are some common flavors - 
1.Ubuntu        2.Fedora        3.Debian        4.Mandrive         5.Arch Linux

Following image shows the architecture of Linux Operating System:-

                                       Architecture of Linux OS 

Architecture of Linux -

• The core or first component of Linux is Hardware on which the operating system is loaded.
• On top of hardware there is Kernel, which is central component of Operating System. Simply you  can say interface between user and software system Or interface between hardware component and  software application.
• The next component of architecture is Shell, basically shell program interprets the commands   which are entered by an user or given as input by a shell script.
• Last layer shows the applications or tasks performed by end users.