opereting system (OS)

opereting system (OS)

1. what is OS?

   • An opereting system (OS) is software that manages computers hardware and software recources and provides common servises for comoputers programs. the operating system application programs usually requiere an operating system to functions

2. how it works?

   • The operating system is (or software) most important program on a computer. To operate other programs the general-purpose computer must have an operating system. Operating systems perform basic tasks, such as recognizing the keyboard connection, sending information to the screen, not losing sight of files and directories on the disk, and controlling peripheral devices such as printers, scanners, etc.
     • In large systems, the operating system has even greater responsibility and power, it's like a traffic cop, you ensure that programs and users that are running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users can not access the system.

3. types of OS

   • 1.Real-time
     • Real-time operating systems are used to control machinery, scientific instruments and industrial systems.
   • 2.Multi-user
     • A multi-user operating system allows many different users to take advantage of the computer's resources simultaneously. The operating system must make sure that the requirements of the various users are balanced, and that each of the programs they are using has sufficient and separate resources so that a problem with one user doesn't affect the entire community of users.
   • 3.Single-user, single task
     • As the name implies, this operating system is designed to manage the computer so that one user can effectively do one thing at a time.
   • 4.Single-user, Multi-tasking
     • This is the type of operating system most people use on their desktop and laptop computers today. Microsoft's Windows and Apple's MacOS platforms are both examples of operating systems that will let a single user have several programs in operation at the same time.

4. OS functions

   • at the simplest level, an operating system does two things
     • 1. It manages the hardware an software resources of the system. In a desktop computer, these resourcesinclude such things as the processor, memory, disk space and more.
     • 2. It provides a stable, consistent way for applications to deal with the hardware without having to know all the details of the hardware