EVOLUTION OF COMPUTERS:
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	- Big systems and non-afordable
	- Different companies created different OS
	- To solve specific purpose
	- Costly
	- Impossible to learn and understand computers

BEGINING OF UNIX OS:
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	- 1969, team of developers started at Bell labs
	- Goal was to create common software for all computers
	- Project name was 'Unix'
	- Used C language to develop Unix OS, instead of assembly language
	- Create a code that is easy and recyclable
	- The recyclable code is known as Kernel
	- Kernel, as it is recyclable, it is used to develop the OS and enhance its features
	- Source code is open source
	- universities, govt orgs and big corporates
	- IBM AIX, HP-UX, Sun solaris

HOW LINUX CAME INTO PICTURE:
============================
	- 1991, Linus Tarvalds, student at Finland, to create a freely available academic version of Unix
	- started writing his own code only his own PC
	- Linus started the project because he was not able to afford the Unix OS
	- He had no ideas about how big this project would become
	- Initially he named it as 'Freax' but changed it to 'Linux'
	- He created the Linux os under his own license but restricted it for commercial use
	- In 1992, he released Linux under GNU - General public license

Linux is everywhere: supercomputers, laptops, tablets, mobiles, routers, washingmachins, watches, servers, cars etc... almost everywhere


LINUX FEATURES:
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	- Multiuser OS
	- Multitasking
	- Portability 
	- Security
	- GUI interface
	- File system
	- Open source