Linux

Linux

Tux the penguin, mascot of Linux
OS family	Unix-like
Working state	Current
Source model	Free and open source software
Platforms	IA-32, MIPS, x86-64, SPARC, DEC Alpha, Itanium, PowerPC, ARM, m68k, PA-RISC, s390, SuperH, M32R and more
Kernel type	Monolithic
License	Various including GNU General Public License, BSD License, Apache License, and others
Official website	kernel.org

Linux (commonly Template:Pron-en, LI-nuks in English, also Template:Pron-en) is a generic term referring to Unix-like computer operating systems based on the Linux kernel. Their development is one of the most prominent examples of free and open source software collaboration; typically all the underlying source code can be used, freely modified, and redistributed, both commercially and non-commercially, by anyone under the terms of the GNU GPL.

Linux is predominantly known for its use in servers, although can be installed on a wide variety of computer hardware, ranging from embedded devices, mobile phones and even some watches to supercomputers. Linux distributions, installed on both desktop and laptop computers, have become increasingly commonplace in recent years, partly owing to the popular Ubuntu distribution and the emergence of netbooks.

The name "Linux" comes from the Linux kernel, originally written in 1991 by Linus Torvalds. The rest of the system usually comprises components such as the Apache HTTP Server, the X Window System, the GNOME and KDE desktop environments, and utilities and libraries from the GNU Project (announced in 1983 by Richard Stallman). Commonly-used applications with desktop Linux systems include the Mozilla Firefox web-browser and the OpenOffice.org office application suite. The GNU contribution is the basis for the Free Software Foundation's preferred name GNU/Linux.

History

See also: History of Linux

Unix

The Unix operating system was conceived and implemented in 1969 at AT&T's Bell Laboratories in the United States by Ken Thompson, Dennis Ritchie, Douglas McIlroy, and Joe Ossanna and first released in 1971. Unix was written in assembly language and later re-written in C in 1973 by Dennis Ritchie. Its wide availability and portability due to being written in C meant that it was widely adopted, copied and modified by academic institutions and businesses, with its design being influential on authors of other systems.

GNU

The GNU Project, started in 1983 by Richard Stallman, had the goal of creating a "complete Unix-compatible software system" composed entirely of free software. Work began in 1984. Later, in 1985, Stallman created the Free Software Foundation and wrote the GNU General Public License (GNU GPL) in 1989. By the early 1990s, many of the programs required in an operating system (such as libraries, compilers, text editors, a Unix shell, and a windowing system) were completed, although low-level elements such as device drivers, daemons, and the kernel were stalled and incomplete. Linus Torvalds has said that if the GNU kernel had been available at the time (1991), he would not have decided to write his own.

MINIX

Andrew S. Tanenbaum, author of the MINIX operating system

MINIX was a cheap minimal Unix-like operating system, designed for education in computer science, written by Andrew S. Tanenbaum (now Minix is free and redesigned also for “serious” use).

In 1991 while attending the University of Helsinki, Torvalds began to work on a non-commercial replacement for MINIX, which would eventually become the Linux kernel.

Torvalds began the development of Linux on Minix and applications written for Minix were also used under Linux. Later Linux matured and it became possible for Linux to be developed under itself. Also GNU applications replaced all Minix ones because, with code from the GNU system freely available, it was advantageous if this could be used with the fledgling OS. Code licensed under the GNU GPL can be used in other projects, so long as they also are released under the same or a compatible license. In order to make the Linux kernel compatible with the components from the GNU Project, Torvalds initiated a switch from his original license (which prohibited commercial redistribution) to the GNU GPL. Developers worked to integrate GNU components with Linux to make a fully functional and free operating system.

Commercial and popular uptake

Main article: Linux adoption

Today Linux distributions are used in numerous domains, from embedded systems to supercomputers, and have secured a place in server installations with the popular LAMP application stack. Use of Linux distributions in home and enterprise desktops has been expanding. They have also gained popularity with various local and national governments. The federal government of Brazil is well known for its support for Linux. News of the Russian military creating their own Linux distribution has also surfaced. Indian state of Kerala has gone so far as to make it mandatory for all state high schools to run Linux on their computers. China uses Linux exclusively as the operating system for its Loongson processor family to achieve technology independence. In Spain some regions have developed their own Linux distributions, which are widely used in education and official institutions, like gnuLinEx in Extremadura and Guadalinex in Andalusia. France and Germany have also taken steps towards the adoption of Linux.

Linux distributions have also become popular with the newly founded netbook market, with many devices such as the ASUS Eee PC and Acer Aspire One shipping with customized Linux distributions pre-installed.

Current development

Torvalds continues to direct the development of the kernel. Stallman heads the Free Software Foundation, which in turn supports the GNU components. Finally, individuals and corporations develop third-party non-GNU components. These third-party components comprise a vast body of work and may include both kernel modules and user applications and libraries. Linux vendors and communities combine and distribute the kernel, GNU components, and non-GNU components, with additional package management software in the form of Linux distributions.

Design

A Linux-based system is a modular Unix-like operating system. It derives much of its basic design from principles established in Unix during the 1970s and 1980s. Such a system uses a monolithic kernel, the Linux kernel, which handles process control, networking, and peripheral and file system access. Device drivers are integrated directly with the kernel.

Separate projects that interface with the kernel provide much of the system's higher-level functionality. The GNU userland is an important part of most Linux-based systems, providing the most common implementation of the C library, a popular shell, and many of the common Unix tools which carry out many basic operating system tasks. The graphical user interface (or GUI) used by most Linux systems is based on the X Window System.

User interface

See also: User interface

Users can control a Linux-based system through a command line interface (or CLI), a graphical user interface (or GUI), or through controls attached to the associated hardware (this is common for embedded systems). For desktop systems, the default mode is usually graphical user interface, where the CLI is available through terminal emulator windows or on a separate virtual console.

On desktop machines, KDE, GNOME and Xfce are the most popular user interfaces, though a variety of additional user interfaces exist. Most popular user interfaces run on top of the X Window System (often simply called "X"), which provides network transparency, enabling a graphical application running on one machine to be displayed and controlled from another.

Other GUIs include X window managers such as FVWM, Enlightenment and Window Maker. The window manager provides a means to control the placement and appearance of individual application windows, and interacts with the X Window System. This is a more minimalist goal than KDE, GNOME et al., which are termed desktop environments.

A Linux system typically provides a CLI through a shell, which is the traditional way of interacting with a Unix system. A Linux distribution specialized for servers may use the CLI as its only interface. A headless system that runs without even a monitor can be controlled by the command line via a remote-control protocol such as SSH or telnet.

Most low-level Linux components, including the GNU userland, use the CLI exclusively. The CLI is particularly suited for automation of repetitive or delayed tasks, and provides very simple inter-process communication. A graphical terminal emulator program is often used to access the CLI from a Linux desktop.

Development

A summarized history of Unix-like operating systems showing Linux's origins. Note that despite similar architectural designs and concepts being shared as part of the POSIX standard, Linux does not share any non-free source code with the original Unix or Minix.

Main article: Linux distribution

The primary difference between Linux and many other popular contemporary operating systems is that the Linux kernel and other components are free and open source software. Linux is not the only such operating system, although it is by far the most widely used. Some free and open source software licenses are based on the principle of copyleft, a kind of reciprocity: any work derived from a copyleft piece of software must also be copyleft itself. The most common free software license, the GNU GPL, is a form of copyleft, and is used for the Linux kernel and many of the components from the GNU project.

Linux based distributions are intended by developers for interoperability with other operating systems and established computing standards. Linux systems adhere to POSIX, SUS, ISO and ANSI standards where possible, although to date only one Linux distribution has been POSIX.1 certified, Linux-FT.

Free software projects, although developed in a collaborative fashion, are often produced independently of each other. The fact that the software licenses explicitly permit redistribution, however, provides a basis for larger scale projects that collect the software produced by stand-alone projects and make it available all at once in the form of a Linux distribution.

A Linux distribution, commonly called a "distro", is a project that manages a remote collection of system software and application software packages available for download and installation through a network connection. This allows the user to adapt the operating system to his/her specific needs. Distributions are maintained by individuals, loose-knit teams, volunteer organizations, and commercial entities. A distribution can be installed using a CD that contains distribution-specific software for initial system installation and configuration. A package manager such as Synaptic or YAST allows later package upgrades and installations. A distribution is responsible for the default configuration of the installed Linux kernel, general system security, and more generally integration of the different software packages into a coherent whole.

Community

See also: Free software community and Linux Users Group

A distribution is largely driven by its developer and user communities. Some vendors develop and fund their distributions on a volunteer basis, Debian being a well-known example. Others maintain a community version of their commercial distributions, as Red Hat does with Fedora.

In many cities and regions, local associations known as Linux Users Groups (LUGs) seek to promote their preferred distribution and by extension free software. They hold meetings and provide free demonstrations, training, technical support, and operating system installation to new users. Many Internet communities also provide support to Linux users and developers. Most distributions and free software / open source projects have IRC chatrooms or newsgroups. Online forums are another means for support, with notable examples being LinuxQuestions.org and the Gentoo forums. Linux distributions host mailing lists; commonly there will be a specific topic such as usage or development for a given list.

There are several technology websites with a Linux focus. Print magazines on Linux often include cover disks including software or even complete Linux distributions.

Although Linux distributions are generally available without charge, several large corporations sell, support, and contribute to the development of the components of the system and of free software. These include Dell, IBM, HP, Oracle, Sun Microsystems, Novell, Nokia. A number of corporations, notably Red Hat, have built their entire business around Linux distributions.

The free software licenses, on which the various software packages of a distribution built on the Linux kernel are based, explicitly accommodate and encourage commercialization; the relationship between a Linux distribution as a whole and individual vendors may be seen as symbiotic. One common business model of commercial suppliers is charging for support, especially for business users. A number of companies also offer a specialized business version of their distribution, which adds proprietary support packages and tools to administer higher numbers of installations or to simplify administrative tasks. Another business model is to give away the software in order to sell hardware.

Programming on Linux

Most Linux distributions support dozens of programming languages. The most common collection of utilities for building both Linux applications and operating system programs is found within the GNU toolchain, which includes the GNU Compiler Collection (GCC) and the GNU build system. Amongst others, GCC provides compilers for Ada, C, C++, Java, and Fortran. The Linux kernel itself is written to be compiled with GCC. Proprietary compilers for Linux include the Intel C++ Compiler, Sun Studio, and IBM XL C/C++ Compiler. BASIC is supported in such forms as Gambas, FreeBASIC, and XBasic.

Most distributions also include support for PHP, Perl, Ruby, Python and other dynamic languages. While not as common, Linux also supports C# via the Mono project, sponsored by Novell, and Scheme. A number of Java Virtual Machines and development kits run on Linux, including the original Sun Microsystems JVM (HotSpot), and IBM's J2SE RE, as well as many open-source projects like Kaffe.

The two main frameworks for developing graphical applications are those of GNOME and KDE. These projects are based on the GTK+ and Qt widget toolkits, respectively, which can also be used independently of the larger framework. Both support a wide variety of languages. There are a number of Integrated development environments available including Anjuta, Code::Blocks, Eclipse, KDevelop, Lazarus, MonoDevelop, NetBeans, and Omnis Studio while the long-established editors Vim and Emacs remain popular.

Uses

As well as those designed for general purpose use on desktops and servers, distributions may be specialized for different purposes including: computer architecture support, embedded systems, stability, security, localization to a specific region or language, targeting of specific user groups, support for real-time applications, or commitment to a given desktop environment. Furthermore, some distributions deliberately include only free software. Currently, over three hundred distributions are actively developed, with about a dozen distributions being most popular for general-purpose use.

Linux is a widely ported operating system kernel. The Linux kernel runs on a highly diverse range of computer architectures: in the hand-held ARM-based iPAQ and the mainframe IBM System z9, in devices ranging from mobile phones to supercomputers. Specialized distributions exist for less mainstream architectures. The ELKS kernel fork can run on Intel 8086 or Intel 80286 16-bit microprocessors, while the µClinux kernel fork may run on systems without a memory management unit. The kernel also runs on architectures that were only ever intended to use a manufacturer-created operating system, such as Macintosh computers (with both PowerPC and Intel processors), PDAs, video game consoles, portable music players, and mobile phones.

There are several industry associations and hardware conferences devoted to maintaining and improving support for diverse hardware under Linux, such as FreedomHEC.

Desktop

GNOME

KDE

Xfce

Main article: Desktop Linux

The popularity of Linux on standard desktops (and laptops) has been increasing over the years. Currently most distributions include a graphical user environment. The two most popular such environments, GNOME and KDE, both of which are mature, support a wide variety of languages.

In the past, the performance of Linux on the desktop has been a controversial topic; for example in 2007 Con Kolivas accused the Linux community of favoring performance on servers. He quit Linux kernel development because he was frustrated with this lack of focus on the desktop, and then gave a "tell all" interview on the topic. However since then significant effort has been expended improving the desktop experience. For example, projects such as upstart aim for a faster boot time. In the field of gaming, the Linux desktop still lags behind Windows, however there are several companies that do port their own or other companies' games to Linux.

Many types of applications available for Microsoft Windows and Mac OS X are also available for Linux. Commonly, either a free software application will exist which does the functions of an application found on another operating systems, or that application will have a version that works on Linux (such as Skype). Furthermore, the Wine project provides a Windows compatibility layer to run unmodified Windows applications on Linux. CrossOver is a proprietary solution based on the open source Wine project that supports running Windows versions of Microsoft Office, Intuit applications such as Quicken and QuickBooks, Adobe Photoshop versions through CS2, and many popular games such as World of Warcraft and Team Fortress 2. In other cases, although there is no Linux port of some software in areas such as desktop publishing and professional audio, there is equivalent software available on Linux.

Many popular applications are available for a wide variety of operating systems. For example Mozilla Firefox, and OpenOffice.org have downloadable versions for all major operating systems. Furthermore, some applications were initially developed for Linux (such as Pidgin, and GIMP) and, due to their popularity, were ported to other operating systems (including Windows and Mac OS X).

A growing number of proprietary desktop applications are also supported on Linux, see List of proprietary software for Linux. In the field of animation and visual effects, most high end software, such as AutoDesk Maya, Softimage XSI and Apple Shake, is available for Linux, Windows and/or Mac OS X.

The collaborative nature of free software development allows distributed teams to localize Linux distributions for use in locales where localizing proprietary systems would not be cost-effective. For example the Sinhalese language version of the Knoppix distribution was available significantly before Microsoft Windows XP was translated to Sinhalese. In this case the Lanka Linux User Group played a major part in developing the localized system by combining the knowledge of university professors, linguists, and local developers.

To install new software in Windows, users either download a digital distribution or use a traditional installation medium (such as CD-ROM). Both of these methods usually provide a "Software Installation Wizard" to guide the user through the setup. On most Linux distributions, there are utilities for browsing a list of thousands of applications installed with a single click. Some of these programs are the Synaptic Package Manager, PackageKit, and Yum Extender. However, installing software not in the official repositories is not always easy, and sometimes the only option is to compile from source.

Servers and supercomputers

Servers designed for Linux

Linux distributions have long been used as server operating systems, and have risen to prominence in that area; Netcraft reported in September 2006 that eight of the ten most reliable internet hosting companies ran Linux distributions on their web servers. (As of June 2008, Linux distributions represented five of ten, FreeBSD three of ten, and Microsoft two of ten.)

Components of IBM Roadrunner, the world's fastest supercomputer 2008, which runs Linux.

Linux distributions are the cornerstone of the LAMP server-software combination (Linux, Apache, MySQL, Perl/PHP/Python) which has achieved popularity among developers, and which is one of the more common platforms for website hosting.

Linux distributions are also commonly used as operating systems for supercomputers: as of June 2009, out of the top 500 systems, 443 (88.6%) run a Linux distribution.

Embedded devices

See also: Embedded Linux and Linux devices

An HTC Dream running Android

Due to its low cost and ability to be easily modified, an embedded Linux is often used in embedded systems. Linux has become a major competitor to the proprietary Symbian OS found in the majority of smartphones—16.7% of smartphones sold worldwide during 2006 were using Linux—and it is an alternative to the proprietary Windows CE and Palm OS operating systems on mobile devices. Cell phones or PDAs running on Linux and built on open source platform became a trend from 2007, like Nokia N810, Openmoko's Neo1973, Motorola RAZR2 v8, Motorola ROKR E8, Motorola MING series, Motorola ZINE and the on-going Google Android. The popular TiVo digital video recorder uses a customized version of Linux. Several network firewall and router standalone products, including several from Cisco/Linksys, use Linux internally, using its advanced firewall and routing capabilities. The Korg OASYS and the Yamaha Motif XS music workstations also run Linux. Furthermore, Linux is used in the leading stage lighting control system, FlyingPig/HighEnd WholeHogIII Console.

Market share and uptake

Main article: Linux adoption

Many quantitative studies of free / open source software focus on topics including market share and reliability, with numerous studies specifically examining Linux. The Linux market is growing rapidly, and the revenue of servers, desktops, and packaged software running Linux was expected to exceed $35.7 billion by 2008.

IDC's Q1 2007 report indicated that Linux held 12.7% of the overall server market at that time. This estimate was based on the number of Linux servers sold by various companies and did not include server hardware purchased separately and had Linux installed on it later. In September 2008 Microsoft CEO Steve Ballmer admitted that 60% of servers run Linux versus 40% that run Windows Server.

Companies have estimated that the desktop market share of Linux range from less than 1% to 2.14%. Aaron Seigo has suggested that it could be 8–12%. In comparison, Microsoft operating systems hold more than 85%.

The frictional cost of switching operating systems and lack of support for certain hardware and application programs designed for Microsoft Windows have been two factors that have inhibited adoption. Proponents and analysts attribute the relative success of Linux to its security, reliability, low cost, and freedom from vendor lock-in.

Also most recently Google has begun to fund Wine, which acts as a compatibility layer, allowing users to run some Windows programs under Linux.

The XO laptop project of One Laptop Per Child is creating a new and potentially much larger Linux community, planned to reach millions of schoolchildren and their families and communities in developing countries. Google, Red Hat, and eBay are major supporters of the project. While the XO will also have a Windows option, it will be primarily deployed using Sugar, a desktop environment for Fedora Linux.

In the film industry, Linux has been the platform of choice for several years. The first major film produced on Linux servers was Titanic in 1997. Since then major studios like Dreamworks Animation, Pixar and Industrial Light & Magic have moved to Linux. Currently more than 95% of the servers and desktops at large animation and visual effects companies use Linux.

See also: Usage share of desktop operating systems and List of Linux computers

Copyright and naming

The Linux kernel and most GNU software are licensed under the GNU General Public License (GPL). The GPL requires that anyone who distributes the Linux kernel must make the source code (and any modifications) available to the recipient under the same terms. In 1997, Linus Torvalds stated, “Making Linux GPL'd was definitely the best thing I ever did.” Other key components of a Linux system may use other licenses; many libraries use the GNU Lesser General Public License (LGPL), a more permissive variant of the GPL, and the X Window System uses the MIT License.

Torvalds states that the Linux kernel will not move from version 2 of the GPL to version 3. He specifically dislikes some provisions in the new license which prohibit the use of the software in digital rights management, and it would also be impractical to obtain permission from all the copyright holders, who number in the thousands.

A 2001 study of Red Hat Linux 7.1 found that this distribution contained 30 million source lines of code. Using the Constructive Cost Model, the study estimated that this distribution required about eight thousand man-years of development time. According to the study, if all this software had been developed by conventional proprietary means, it would have cost about $1.91 billion (2024 US dollars) to develop in the United States.

Most of the code (71%) was written in the C programming language, but many other languages were used, including C++, assembly language, Perl, Python, Fortran, and various shell scripting languages. Slightly over half of all lines of code were licensed under the GPL. The Linux kernel itself was 2.4 million lines of code, or 8% of the total.

In a later study, the same analysis was performed for Debian GNU/Linux version 4.0. This distribution contained over 283 million source lines of code, and the study estimated that it would have cost $10.5 billion (2024 US dollars) to develop by conventional means.

In the United States, the name Linux is a trademark registered to Linus Torvalds. Initially, nobody registered it, but on 15 August 1994, William R. Della Croce, Jr. filed for the trademark Linux, and then demanded royalties from Linux distributors. In 1996, Torvalds and some affected organizations sued him to have the trademark assigned to Torvalds, and in 1997 the case was settled. The licensing of the trademark has since been handled by the Linux Mark Institute. Torvalds has stated that he trademarked the name only to prevent someone else from using it. LMI originally charged a nominal sublicensing fee for use of the Linux name as part of trademarks, but later changed this in favor of offering a free, perpetual worldwide sublicense.

See also: SCO-Linux controversies

GNU/Linux

Main article: GNU/Linux naming controversy

The Free Software Foundation views Linux distributions which use GNU software as GNU variants and they ask that such operating systems be referred to as GNU/Linux or a Linux-based GNU system. The media and common usage, however, refers to this family of operating systems simply as Linux, as do many large Linux distributions (e.g. Ubuntu and SuSE Linux). Some distributions use GNU/Linux (particularly notable is Debian GNU/Linux, on which Ubuntu is based), but the term's use outside of the enthusiast community is limited. The naming issue remains controversial. Linus Torvalds does not support the use of the term GNU/Linux.

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ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over 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ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over 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ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over 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ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over 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ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over 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ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over 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ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand Its over ninethousand

Further reading

• Weinberg, Bill (July 2008). Uniting Mobile Linux Application Platforms (PDF). LinuxPundit.com. p. 18.

External links

• Linux.org website
• Linux.com website
• Linux kernel website and archives
• The Linux Mark Institute (manages the Linux trade mark)
• The Linux Foundation
• GNU Project website
• The Linux Documentation Project
• Intro to Linux at HowStuffWorks
• Catalog of Linux, GNU and FOSS documentation
• The Linux Information Project (LINFO)
• Graphical map of Linux, GNU and FOSS