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An operating system (OS and O/S) is the software component of a computer system -- Used by all computers, including handheld computers, desktop computers, supercomputers, and even video game consoles -- that is responsible for the management and coordination of activities and the sharing of the resources of the computer.

Mostrly known Os , O/S are:
The Microsoft Windows family of operating systems originated as an add-on to the older MS-DOS operating system for the IBM PC. The most widely used version of the Microsoft Windows family is Windows XP, and Windows Vista,

Mac OS X is a line of proprietary, graphical operating systems developed, marketed, and sold by Apple Inc., the latest of which is pre-loaded on all currently shipping Macintosh computers. successor to the original Mac OS, which had been Apple's primary operating system since 1984

The Unix-like family is a diverse group of operating systems, with several major sub-categories including System V, BSD, and Linux. The name "UNIX" is a trademark of The Open Group which licenses it for use with any operating system that has been shown to conform to their definitions. "Unix-like" is commonly used to refer to the large set of operating systems which resemble the original Unix.

Plan 9 was designed from the start to be a networked operating system, and had graphics built-in, unlike Unix, which added these features to the design later. Plan 9 has yet to become as popular as Unix derivatives, but it has an expanding community of developers.

A real-time operating system (RTOS) is a multitasking operating system intended for applications with fixed deadlines (real-time computing). Such applications include some small embedded systems, automobile engine controllers, industrial robots, spacecraft, industrial control, and some large-scale computing systems.

Embedded systems use a variety of dedicated operating systems. In some cases, the "operating system" software is directly linked to the application to produce a monolithic special-purpose program. Some embedded systems use operating systems such as Symbian OS, Palm OS, Windows CE, BSD, and Linux.

Operating system development, or OSDev, as a hobby has a large cult-like following. As such, operating systems, such as Linux, have derived from hobby operating system projects.

Other proprietary Unix-like and POSIX-compliant
SDS (Scientific Data Systems) , TRON Project , UNIVAC (later Unisys) , WAVECOM

Linux distribution is a member of the Linux family of Unix-like software distributions.
One can distinguish between commercially backed distributions, such as Fedora (Red Hat), SUSE Linux (Novell), Ubuntu (Canonical Ltd.), and Mandriva Linux and community distributions such as Debian and Gentoo.

List of Linux distributions
Debian-based , Knoppix-based ,  Ubuntu-based , Gentoo-based , RPM-based ,
Fedora-based , Red Hat Enterprise Linux-based , Slackware-based , SLAX-Based .


Early, proprietary microcomputer OS
Acorn , Amiga ,  Apollo ,  Apple , Atari ,  Be Incorporated , Burroughs (later Unisys) ,
Convergent Technologies , Digital/Tandem Computers/Compaq/HP , Fujitsu ,
Green Hills Software ,   Hewlett-Packard ,  Intel , IBM ,  ICL (formerly ICT) ,
 LynuxWorks (originally Lynx Real-time Systems) ,  Micrium,  Microsoft ,  Novell ,
 QANTEL ,  RCA ,   SCO / The SCO Group ,   Unicoi Systems ,  Wind River Systems ,
 Non-Standard languages ,   Lisp-based operating systems ,


 

 

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