Operating System Notes PDF

TOPIC: OPERATING SYSTEM SPECIFIC OBJECTIVES: by the end of the lesson, you will be able to do the following; 1.Define operating system; 2.State the types of operating system and explain at least two types of operating system; 3.Define batch and real- time operating system; 4.State at least thre...

TOPIC: OPERATING SYSTEM SPECIFIC OBJECTIVES: by the end of the lesson, you will be able to do the following; 1.Define operating system; 2.State the types of operating system and explain at least two types of operating system; 3.Define batch and real- time operating system; 4.State at least three functions of operating system; 5.State the differences between DOS and GUI. Understanding what a Software is a set of instructions and software is procedure passed to the computer to perform certain activities or tasks; it is the blood that flows through the software computer system. Application System software software Operating system  An operating system (OS) is software that manages Operating System computer hardware and software resources and provides common services for computer programs. OS is an important program and considered as the backbone of a computer. Types of Operating System Basically, there are two main types of operating system; 1.Single user operating system. 2.Multi-user operating system.  Single User Operating System Single user operating system is divided into two; Single-user, multi- Single user, single tasking: the user has task: the user can several programs in only do one thing at operation at the same a time. Some time. E.g. a windows user handheld devices can be writing a note in a (palm OS, MS-DOS) word processor while are good examples. downloading a file from Multi-user operating system This operating system allows many different users to use the computers resources simultaneously. Time sharing systems and internet servers can be classified as multi-user systems. E.g.unix, MENT: Study the following xenix type of etc. system from your tex operating 1.Multi-tasking operating system 2.Distributed operating system/ network 3.Batch processing operating  Examples of operating system 1.MS. DOS 2.MS. Windows 3.Linux ( a GUI/ command line multiuser and network OS) 4.Xenix (a unix based multiuser OS) 5.Unix (a multi-user command line OS) 6.Mac OS(macintosh) 7.Novell netware(command line network unctions of operating system 1.Resources management: OS manages the hardware and software resources of the system. 2.Storage management: OS controls the storage operations and device allocation 3.Process management: OS ensures that active process in the computer gets fair and non-interfering access to the central processing unit for execution. 4.Security management: OS protects the computer from unauthorized or mischievous intervention such as