An operating system is the fundamental basis of all other application programs. Operating system is an intermediary between the users and the hardware.
Operating system controls and coordinates the use of hardware among application programs. The major services of an operating system are −
Following are the major applications of an operating system −
An operating system is accountable for the formation and deletion of files and directories.
An operating system manages the process of deletion, suspension, resumption, and synchronization.
An operating system manages memory space by allocation and de-allocation.
An operating system stores, organizes, and names and protects the existing files.
Further, an operating system manages all the components and devices of the computers system including modems, printers, plotters, etc.
In case, if any device fails, the operating system detects and notify.
An operating system protects from destruction as well as from unauthorized use.
An operating system facilitates the interface to user and hardware.
Following are the major types of operating system −
Let us now discuss each operating system in detail.
MS-DOS is one of the oldest and widely used operating system. DOS is a set of computer programs, the major functions of which are file management, allocation of system resources, providing essential features to control hardware devices.
DOS commands can be typed in either upper case or lower case.
Following are the significant features of DOS −
Following are the major types of DOS Command −
Internal Commands − Commands such as DEL, COPY, TYPE, etc. are the internal commands that remain stored in computer memory.
External Commands − Commands like FORMAT, DISKCOPY, etc. are the external commands and remain stored on the disk.
The operating system window is the extension of the disk operating system.
It is the most popular and simplest operating system; it can be used by any person who can read and understand basic English, as it does not require any special training.
However, the Windows Operating System requires DOS to run the various application programs initially. Because of this reason, DOS should be installed into the memory and then window can be executed.
Following are the significant element of Windows Operating System (WOS) −
Following are the different versions of Windows Operating System −
|Window 1.01||1985||Windows XP Professional x64||2005|
|Windows NT 3.1||1993||Windows Vista||2007|
|Windows 95||1995||Windows 7||2009|
|Windows 98||1998||Windows 8||2012|
|Windows 2000||2000||Windows 10||2015|
|Windows ME||2000||Windows Server 2016||2016|
The Unix Operating System is the earliest operating system developed in 1970s. Let us consider the following points relating to the Unix Operating System −
It is an operating system that has multitasking features.
It has multiuser computer operating systems.
It runs practically on every sort of hardware and provides stimulus to the open source movement.
It has comparative complex functionality and hence an untrained user cannot use it; only the one who has taken training can use this system.
Another drawback of this system is, it does not give notice or warn about the consequences of a user’s action (whether user’s action is right or wrong).