Operating System

Operating System

1. An operating system (abbreviated as "OS") is the program that, after being initially loaded into the computer by a boot program, manages all the other programs in a computer. The other programs are called applications or application programs. An example of an Operating System is Windows, Linux, and Macintosh.

   • What is an operating system?

2. How it works?

   • It acts as an interface between an application and the hardware. The user interacts with the hardware from "the other side". The operating system is a set of services which simplifies development of applications. Executing a program involves the creation of a process by the operating system. Creates a process by assigning memory and other resources, establishing a priority for the process (in multi-tasking systems), loading program code into memory, and executing the program

3. Types of OS

   • ·Real-time operating system
     • Single-user, multi-tasking
       • Single-user, single task
         • Multi-user

4. OS functions

   • 1- It manages the hardware and software resources of the system. For example, in a desktop computer, include things as the processor, memory...
     • 2- It provides a stable, consistent way for applications to deal with the hardware without having to know all the details of the hardware.

5. OS developments

   • OS developers have made the Internet the standard method for delivering crucial operating system updates and bug fixes..
     • A process called NetBooting has streamlined the capability to move the working operating system of a standard consumer desktop computer -- kernel, user interface and all -- off of the machine it controls
       • Linux created and distributed according to the principles of open source, has had a significant impact on the operating system in general.