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Definition: Linux


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 the majority of 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. Apple's software is based on Unix as well. See Unix.

Linux is in every Android smartphone and tablet. It also has a small market share of personal computers, although minuscule compared to Windows and Mac but steadily growing due to Google's Linux laptop (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 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-oriented 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 in some early iPod music players that ran a version of Linux from the iPodLinux Project. (Image courtesy of the iPodLinux Project)