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(computer science)
A freely available, open-source Unix-like operating system kernel capable of running on many different types of computer hardware; first released in 1991.


(operating system)
("Linus Unix") /li'nuks/ (but see below) An implementation of the Unix kernel originally written from scratch with no proprietary code.

The kernel runs on Intel and Alpha hardware in the general release, with SPARC, PowerPC, MIPS, ARM, Amiga, Atari, and SGI in active development. The SPARC, PowerPC, ARM, PowerMAC - OSF, and 68k ports all support shells, X and networking. The Intel and SPARC versions have reliable symmetric multiprocessing.

Work on the kernel is coordinated by Linus Torvalds, who holds the copyright on a large part of it. The rest of the copyright is held by a large number of other contributors (or their employers). Regardless of the copyright ownerships, the kernel as a whole is available under the GNU General Public License. The GNU project supports Linux as its kernel until the research Hurd kernel is completed.

This kernel would be no use without application programs. The GNU project has provided large numbers of quality tools, and together with other public domain software it is a rich Unix environment. A compilation of the Linux kernel and these tools is known as a Linux distribution. Compatibility modules and/or emulators exist for dozens of other computing environments.

The kernel version numbers are significant: the odd numbered series (e.g. 1.3.xx) is the development (or beta) kernel which evolves very quickly. Stable (or release) kernels have even major version numbers (e.g. 1.2.xx).

There is a lot of commercial support for and use of Linux, both by hardware companies such as Digital, IBM, and Apple and numerous smaller network and integration specialists. There are many commercially supported distributions which are generally entirely under the GPL. At least one distribution vendor guarantees Posix compliance. Linux is particularly popular for Internet Service Providers, and there are ports to both parallel supercomputers and embedded microcontrollers. Debian is one popular open source distribution.

The pronunciation of "Linux" has been a matter of much debate. Many, including Torvalds, insist on the short I pronunciation /li'nuks/ because "Linus" has an /ee/ sound in Swedish (Linus's family is part of Finland's 6% ethnic-Swedish minority) and Linus considers English short /i/ to be closer to /ee/ than English long /i:/ dipthong. This is consistent with the short I in words like "linen". This doesn't stop others demanding a long I /li:'nuks/ following the english pronunciation of "Linus" and "minus". Others say /li'niks/ following Minix, which Torvalds was working on before Linux.

More on pronunciation.

LinuxHQ. slashdot. freshmeat. Woven Goods. Linux Gazette.

funet Linux Archive, US mirror, UK Mirror.


An open source operating system that is the most widely used OS worldwide. Linux runs on all major hardware platforms, including x86, ARM and IBM mainframes, as well as minor ones. Based on the design principles in Unix, Linux runs in most of the servers on the Internet and in nearly every consumer electronics product controlled by a microprocessor (see embedded Linux). Linux is known for its stability because its Unix-like architecture keeps applications isolated from the core operating system. See Unix.

Except for Apple and Microsoft products, Linux is the OS in every smartphone and tablet (Apple's iPhone/iPad iOS is based on Unix). As a personal computer OS, Linux has a tiny market share compared to Windows and Mac, but it is steadily growing due to Google's Chrome OS (see Chromebook).

Hundreds of Distros
Licensed under the GNU General Public License (GPL), Linux is "the" flagship product of the open source community. Numerous groups modify Linux for various purposes, and there are literally hundreds of versions, known as "distributions" or "distros." Most distros are free, and all use the Linux kernel (the core of Linux). Commercial organizations, such as Red Hat and Suse, sell Linux with tech support for a fee. Linux is also IEEE compliant (see POSIX). See Linux distribution, open source and GNU General Public License.

Desktop vs. Server
The many desktop distros of Linux come with an assortment of free and mostly worthwhile applications, and many more are available for download. Linux versions of word processing, spreadsheets, paint and drawing apps, media players and video editors are full featured programs that often rival their Windows and Mac counterparts. In contrast, server versions of Linux are typically used in a headless mode (no mouse, no keyboard) and include administration and networking tools rather than user productivity apps. See package manager.

Not Just One User Interface
Linux employs the X Window rendering system to create the basic window, but desktop versions of Linux rely on third-party user interfaces to display the borders, buttons, menus, icons and desktop that users manipulate. KDE and GNOME are two of the most popular, and both may be included in a distro. See X Window, KDE and GNOME.

From Unix to Minix to Linux
In 1990, Finnish computer science student Linus Torvalds created Linux. He was inspired by Minix, a classroom teaching tool similar to Unix. Although Torvalds created the kernel, many of the supporting libraries, utilities and applications have come from the GNU Project, which is why Linux is often designated as GNU/Linux. Over the years, a huge number of programmers have contributed. Torvalds maintains the kernel, and Linux is his registered trademark.

Linux Is Really "Lee-Nooks"
The most common pronunciation is "lynn-icks." However, because in Finnish, Linus is pronounced "lee-noose," Torvalds named it "lee-nooks." It may also be called "line-icks" as many people call Linus "line-iss." See embedded Linux, Minix, Ubuntu, SuSE Linux, UnitedLinux, CoreOS, OS virtualization, GNU, open source, Linux Foundation, Trinux, SCO and Red Hat.

A Ubuntu Linux Desktop
This is a Linux desktop PC from System76. In 2005, System76 was first to offer off-the-shelf Ubuntu Linux computers (see Ubuntu). (Image courtesy of System76,

Linux in Your TV
MontaVista Linux provides the user interface in this Sony TV. Increasingly, people find a GPL open source license with the electronics they purchase, which covers the legal use of the software running in the device. See GNU General Public License.

The Linux Logo
The Linux mascot is a penguin, and it appeared on some early iPods running a version of Linux from the iPodLinux Project. (Image courtesy of the iPodLinux Project)
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