Lecture 1 Niyaz M. Salih

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1 Lecture 1 Niyaz M. Salih

2 Definition An Operating System, or OS, is low-level software that enables a user and higher-level application software to interact with a computer s hardware and the data and other programs stored on the computer. OS By Eng. Niyaz M. Salih 2

3 Operating Systems functions: The main functions of operating systems are: -Etc. -Program creation -Program execution -Input/Output operations -Error detection OS By Eng. Niyaz M. Salih 3

4 Characteristics of Linux Multi-user A multi-user operating system allows for multiple users to use the same computer at the same time and/or different times. Multiprocessing An operating system capable of supporting and utilizing more than one computer processor. OS By Eng. Niyaz M. Salih 4

5 Characteristics of Linux Multitasking An operating system that is capable of allowing multiple software processes to run at the same time. Multithreading Operating systems that allow different parts of a software program to run concurrently. Operating systems that would fall into this category are: OS By Eng. Niyaz M. Salih 5

6 Linux Open source code OS and it is freely available to everyone. GUI operating system, including many of the tools that Windows users are familiar with such as, -A file manager -A Window manager -A help system -A configuration. Open source means any developer can customize code to create Linux OS. OS By Eng. Niyaz M. Salih 6

7 Distribution packages Since Linux is open source. Lots of communities and companies made specific Operating system by using Linux. These specific operating systems are known as distribution of Linux. Some of them are free (community developed) and few are paid also. Following are few popular Linux distributions: -CentOS -Fedora -Suse Linux -Ubuntu -Red Hat Enterprise Linux OS By Eng. Niyaz M. Salih 7

8 Ubuntu Distribution Ubuntu is an ancient African word meaning humanity to others. It also means I am what I am because of who we all are. The Ubuntu operating system brings the spirit of Ubuntu to the world of computers OS By Eng. Niyaz M. Salih 8

9 Ubuntu desktop operating system powers millions of PCs and laptops around the world. Complete Open source Secure Accessible OS By Eng. Niyaz M. Salih 9

10 Complete Ubuntu comes with everything you need to run your organization, school, home or enterprise. All the essential applications, like an office suite, browsers, and media apps come pre-installed and thousands more games and applications are available in the Ubuntu Software Centre OS By Eng. Niyaz M. Salih 10

11 Open source Ubuntu has always been free to download, use and share. We believe in the power of open source software; Ubuntu could not exist without its worldwide community of voluntary developers. OS By Eng. Niyaz M. Salih 11

12 Secure With a built-in firewall and virus protection software, Ubuntu is one of the most secure operating systems around. And the long-term support releases give you five years of security patches and updates. OS By Eng. Niyaz M. Salih 12

13 Accessible Computing is for everyone regardless of nationality, gender or disability. Ubuntu is fully translated into over 50 languages and includes essential assistive technologies.. OS By Eng. Niyaz M. Salih 13

Unit 11 Computer Network Introduction to Network Operating Systems

Unit 11 Computer Network Introduction to Network Operating Systems Network Operating Systems Just as a computer cannot operate without a computer operating system, a network of computers cannot operate