UNIX

UNIX

UNIX was introduced in the year 1969.

Official release date: 1st January 1970.

UNIX is an opensource operating system.

It means that the operating system is available free of cost.

It can be downloaded freely through the internet.

The sourcecode is freely available.

Opensource operating systems stay under the lisence named as:

GPL-GNU (General Public Lisence -Graphical not Unix).

This lisence states that you can use the Operating System, you can modify the operating system, but you cannot sell the operating system.

As we all know, the kernel is the heart of the operating system, without the kernel, the operating system cannot be loaded.

In case of Unix operating system, the kernel version number cannot be changed.

Therefore, even if you try to change the whole Operating system and sell it, you cannot, because the kernel version number will be the same.

In various operating systems like windows, we have access only till the GUI.

But, in Unix, we have access till the SHELL.

The SHELL acts as an interpreter between the GUI and the KERNEL (human readable code to machine readable code and vice versa).

The KERNEL is a combination of hardware as well as software

• KERNEL will check weather data recieved from the SHELL is 100%.
• It will check the working of the hardware devices and applications etc.

HARDWARE takes the input, processes it, and gives the output.

(For eg: A word document would initailly use the processor,RAM. Once the file is saved, it would make use of the harddisk).