what operational system is called UNIX

Hi nhamil:

Thanks for the interesting question. 

UNIX is a computer operating system created by Bell Labs in the 1960s.
Its two main distiguishing characteristics are that it is:

* Multitasking - allows for more than one task/program to be run at a
time.
* Multiuser - can support more than one user at a time.


An excellent telling of the history of UNIX (including its creation,
overview, and inventors) can be found at the Bell Labs (now called
Lucent Technologies) site:

The Creation of the UNIX* Operating System
URL: http://www.bell-labs.com/history/unix/


The three main parts of the UNIX operating system are:

* The kernel - the core of the program which is loaded up when you
start.

* The shell - the program where you enter your commands to the
operating system.

* The file system - where your files and data are stored.

More about these three important parts and other valuable information
can be found at the following excellent tutorial:

Unix Tutorial
URL: http://www.cs.wayne.edu/labPages/Unix_T/start.html


I hope this information helps with your research.  
                           
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