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An operating system (OS) is a computer program that manages the hardware and software resources of a computer. At the foundation of all system software, an operating system performs basic tasks such as controlling and allocating memory, prioritizing system requests, controlling input and output devices, facilitating networking, and managing files. It also may provide a graphical user interface for higher level functions. It forms a platform for other software. (read more on wikipedia)

[edit] Microsoft

Microsoft Home Page

[edit] MS-DOS/Windows 9x

[edit] Windows 2000-XP

[edit] Unix/*nix

[edit] Solaris

[edit] Linux

Operating systems based on a Posix kernel and GNU tools, typically released under an free software license like GPL

What is linux? http://www.linux.org/lessons/beginner/l1/lesson1b.html

[edit] Distributions

• Debian: based on deb package manager. For example Ubuntu, Mepis, ....
• rpm based versions: Fedora/RedHat, SuSE (now Novel), ....

[edit] BSDs

• FreeBSD
• OpenBSD
• NetBSD

[edit] Darwin/Mac OSX

[edit] Others

[edit] Mainframe

[edit] Embedded Systems

[edit] PDA and Mobile Phones

[edit] Read More

Read about the history_of_operating_systems A simple introduction to operating systems A more detailed introduction to Basic OS concepts at Wikipedia