Unix is the first Operating system in the world, developed by Kem Thompson and Dennis Ritchie in 1969 at Bell Lab by AT&T Company

IBM : AIX

SGI : IRIX

HP : HP

Sun : Solaris

FSF:

Free software foundation organization, they start a project by name GNU. The mail aim of this project is to develop such a O.S that can run on any platform.

In 1991, a student Linus Torvalds developed a kernel named Linus’s Kernel plus GNU application called Linux O.S

Linux is a open source technology.

Different companies that provide Linux in Market are Redhat, SuSe, Mandrake, Turbo, Knoppix etc.

Features:

1. Linux is the fastest Operating system in the world. It runs 2 to 3 times fast than windows O.S
2. Linux is the very secured O.S because there is no any problem of virus.
3. Linux file format is text format and windows file format is binary format.
4. Linux is very reliable O.S because kernel of linux is very stable as compare to windows kernel not crashed easily.
5. Kernel of linux is very small, it can be stored in floppy
6. Linux uses the x-Window system which is advanced network windowing system. Using this system we can display output of any workstation monitor attached in the network

1. Virus Proof
2. Crash Proof
3. Economical
4. Multiuser, multi desktop and multi tasking