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Linux

linux mint, linux
Linux pronounced i/ˈlɪnəks/ LIN-əks or, less frequently, /ˈlaɪnəks/ LYN-əks is a Unix-like computer operating system assembled under the model of free and open-source software development and distribution The defining component of Linux is the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds The Free Software Foundation uses the name GNU/Linux to describe the operating system, which has led to some controversy; while they explicitly have no controversy over the name Android they object to it on proprietary grounds however, as GNU isn't a part of it

Linux was originally developed as a free operating system for personal computers based on the Intel x86 architecture, but has since been ported to more platforms than any other operating system Because of the dominance of Android on smartphones, Linux has the largest installed base of all general-purpose operating systems Linux is also the leading operating system on servers and other big iron systems such as mainframe computers and virtually all fastest supercomputers, but is used on only around 23% of desktop computers; not including Chrome OS, used in Chromebooks, that are dominating the US K–12 education market, while overall in the US are at about 5% and representing nearly 20% of the sub-$300 notebook sales Linux also runs on embedded systems, which are devices whose operating system is typically built into the firmware and is highly tailored to the system; this includes smartphones and tablet computers running Android and other Linux derivatives, TiVo and similar DVR devices, network routers, facility automation controls, televisions, video game consoles and smartwatches

The development of Linux is one of the most prominent examples of free and open-source software collaboration The underlying source code may be used, modified and distributed—​​commercially or non-commercially—​​by anyone under the terms of its respective licenses, such as the GNU General Public License Typically, Linux is packaged in a form known as a Linux distribution or distro for short for both desktop and server use Some of the most popular mainstream Linux distributions are Arch Linux, CentOS, Debian, Fedora, Gentoo Linux, Linux Mint, Mageia, openSUSE and Ubuntu, together with commercial distributions such as Red Hat Enterprise Linux and SUSE Linux Enterprise Server Distributions include the Linux kernel, supporting utilities and libraries, many of which are provided by the GNU Project, and usually a large amount of application software to fulfil the distribution's intended use

Desktop Linux distributions include a windowing system, such as X11, Mir or a Wayland implementation, and an accompanying desktop environment such as GNOME or the KDE Software Compilation; some distributions may also include a less resource-intensive desktop, such as LXDE or Xfce Distributions intended to run on servers may omit all graphical environments from the standard install, and instead include other software to set up and operate a solution stack such as LAMP Because Linux is freely redistributable, anyone may create a distribution for any intended use

Contents

  • 1 History
    • 11 Antecedents
    • 12 Creation
    • 13 Naming
    • 14 Commercial and popular uptake
    • 15 Current development
  • 2 Design
    • 21 User interface
    • 22 Video input infrastructure
  • 3 Development
    • 31 Community
    • 32 Programming on Linux
  • 4 Hardware support
  • 5 Uses
    • 51 Desktop
      • 511 Performance and applications
      • 512 Components and installation
    • 52 Netbooks
    • 53 Servers, mainframes and supercomputers
    • 54 Smart devices
    • 55 Embedded devices
    • 56 Gaming
    • 57 Specialized uses
      • 571 Home theater PC
      • 572 Digital security
      • 573 System rescue
      • 574 In space
      • 575 Education
      • 576 Others
  • 6 Market share and uptake
  • 7 Copyright, trademark, and naming
  • 8 See also
  • 9 Notes
  • 10 References
  • 11 External links

History

Main article: History of Linux

Antecedents

Linus Torvalds, principal author of the Linux kernel

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 First released in 1971, Unix was written entirely in assembly language as it was common practice at the time Later, in a key pioneering approach in 1973, it was rewritten in the C programming language by Dennis Ritchie with exceptions to the kernel and I/O The availability of a high-level language implementation of Unix made its porting to different computer platforms easier

Due to an earlier antitrust case forbidding it from entering the computer business, AT&T was required to license the operating system's source code to anyone who asked As a result, Unix grew quickly and became widely adopted by academic institutions and businesses In 1984, AT&T divested itself of Bell Labs; freed of the legal obligation requiring free licensing, Bell Labs began selling Unix as a proprietary product

The GNU Project, started in 1983 by Richard Stallman, has the goal of creating a "complete Unix-compatible software system" composed entirely of free software Work began in 1984 Later, in 1985, Stallman started 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 stated that if the GNU kernel had been available at the time 1991, he would not have decided to write his own

Although not released until 1992 due to legal complications, development of 386BSD, from which NetBSD, OpenBSD and FreeBSD descended, predated that of Linux Torvalds has also stated that if 386BSD had been available at the time, he probably would not have created Linux

MINIX was created by Andrew S Tanenbaum, a computer science professor, and released in 1987 as a minimal Unix-like operating system targeted at students and others who wanted to learn the operating system principles Although the complete source code of MINIX was freely available, the licensing terms prevented it from being free software until the licensing changed in April 2000

Creation

In 1991, while attending the University of Helsinki, Torvalds became curious about operating systems and frustrated by the licensing of MINIX, which at the time limited it to educational use only He began to work on his own operating system kernel, which eventually became the Linux kernel

Torvalds began the development of the Linux kernel on MINIX and applications written for MINIX were also used on Linux Later, Linux matured and further Linux kernel development took place on Linux systems GNU applications also replaced all MINIX components, because it was advantageous to use the freely available code from the GNU Project with the fledgling operating system; code licensed under the GNU GPL can be reused in other computer programs as long as they also are released under the same or a compatible license Torvalds initiated a switch from his original license, which prohibited commercial redistribution, to the GNU GPL Developers worked to integrate GNU components with the Linux kernel, making a fully functional and free operating system

Naming

525-inch floppy disks holding a very early version of Linux

Linus Torvalds had wanted to call his invention "Freax", a portmanteau of "free", "freak", and "x" as an allusion to Unix During the start of his work on the system, some of the project's makefiles included the name "Freax" for about half a year Torvalds had already considered the name "Linux", but initially dismissed it as too egotistical

In order to facilitate development, the files were uploaded to the FTP server ftpfunetfi of FUNET in September 1991 Ari Lemmke, Torvald's coworker at the Helsinki University of Technology HUT, who was one of the volunteer administrators for the FTP server at the time, did not think that "Freax" was a good name So, he named the project "Linux" on the server without consulting Torvalds Later, however, Torvalds consented to "Linux"

To demonstrate how the word "Linux" should be pronounced i/ˈlɪnəks/ LIN-əks, Torvalds included an audio guide  listen  with the kernel source code Another variant of pronunciation is /ˈlaɪnəks/ LYN-əks

Commercial and popular uptake

Main article: Linux adoption Ubuntu, a popular Linux distribution Nexus 5X running Android

Adoption of Linux in production environments, rather than being used only by hobbyists, started to take off first in the mid-1990s in the supercomputing community, where organizations such as NASA started to replace their increasingly expensive machines with clusters of inexpensive commodity computers running Linux Commercial use followed when Dell and IBM, followed by Hewlett-Packard, started offering Linux support to escape Microsoft's monopoly in the desktop operating system market

Today, Linux systems are used throughout computing, from embedded systems to supercomputers, and have secured a place in server installations such as the popular LAMP application stack Use of Linux distributions in home and enterprise desktops has been growing Linux distributions have also become popular in the netbook market, with many devices shipping with customized Linux distributions installed, and Google releasing their own Chrome OS designed for netbooks

Linux's greatest success in the consumer market is perhaps the mobile device market, with Android being one of the most dominant operating systems on smartphones and very popular on tablets and, more recently, on wearables Linux gaming is also on the rise with Valve showing its support for Linux and rolling out its own gaming oriented Linux distribution Linux distributions have also gained popularity with various local and national governments, such as the federal government of Brazil

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, deriving 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, access to the peripherals, and file systems Device drivers are either integrated directly with the kernel, or added as modules that are loaded while the system is running

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 CLI 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 built on top of an implementation of the X Window System More recently, the Linux community seeks to advance to Wayland as the new display server protocol in place of X11; Ubuntu, however, develops Mir instead of Wayland

Various layers within Linux, also showing separation between the userland and kernel space
User mode User applications For example, bash, LibreOffice, Apache OpenOffice, Blender, 0 AD, Mozilla Firefox, etc
Low-level system components: System daemons:
systemd, runit, logind, networkd, soundd,
Windowing system:
X11, Wayland, Mir, SurfaceFlinger Android
Other libraries:
GTK+, Qt, EFL, SDL, SFML, FLTK, GNUstep, etc
Graphics:
Mesa, AMD Catalyst,
C standard library open, exec, sbrk, socket, fopen, calloc, up to 2000 subroutines
glibc aims to be POSIX/SUS-compatible, uClibc targets embedded systems, bionic written for Android, etc
Kernel mode Linux kernel stat, splice, dup, read, open, ioctl, write, mmap, close, exit, etc about 380 system calls
The Linux kernel System Call Interface SCI, aims to be POSIX/SUS-compatible
Process scheduling
subsystem
IPC
subsystem
Memory management
subsystem
Virtual files
subsystem
Network
subsystem
Other components: ALSA, DRI, evdev, LVM, device mapper, Linux Network Scheduler, Netfilter
Linux Security Modules: SELinux, TOMOYO, AppArmor, Smack
Hardware CPU, main memory, data storage devices, etc

Installed components of a Linux system include the following:

  • A bootloader, for example GNU GRUB, LILO, SYSLINUX, or Gummiboot This is a program that loads the Linux kernel into the computer's main memory, by being executed by the computer when it is turned on and after the firmware initialization is performed
  • An init program, such as the traditional sysvinit and the newer systemd, OpenRC and Upstart This is the first process launched by the Linux kernel, and is at the root of the process tree: in other terms, all processes are launched through init It starts processes such as system services and login prompts whether graphical or in terminal mode
  • Software libraries, which contain code that can be used by running processes On Linux systems using ELF-format executable files, the dynamic linker that manages use of dynamic libraries is known as ld-linuxso If the system is set up for the user to compile software themselves, header files will also be included to describe the interface of installed libraries Besides the most commonly used software library on Linux systems, the GNU C Library glibc, there are numerous other libraries
    • C standard library is the library needed to run standard C programs on a computer system, with the GNU C Library being the most commonly used Several alternatives are available, such as the EGLIBC which was used by Debian for some time and uClibc which was designed for uClinux
    • Widget toolkits are the libraries used to build graphical user interfaces GUIs for software applications Numerous widget toolkits are available, including GTK+ and Clutter developed by the GNOME project, Qt developed by the Qt Project and led by Digia, and Enlightenment Foundation Libraries EFL developed primarily by the Enlightenment team
  • User interface programs such as command shells or windowing environments

User interface

The user interface, also known as the shell, is either a command-line interface CLI, a graphical user interface GUI, or through controls attached to the associated hardware, which is common for embedded systems For desktop systems, the default mode is usually a graphical user interface, although the CLI is available through terminal emulator windows or on a separate virtual console

CLI shells are text-based user interfaces, which use text for both input and output The dominant shell used in Linux is the Bourne-Again Shell bash, originally developed for the GNU project Most low-level Linux components, including various parts of the userland, use the CLI exclusively The CLI is particularly suited for automation of repetitive or delayed tasks, and provides very simple inter-process communication

On desktop systems, the most popular user interfaces are the GUI shells, packaged together with extensive desktop environments, such as the K Desktop Environment KDE, GNOME, MATE, Cinnamon, Unity, LXDE, Pantheon and Xfce, though a variety of additional user interfaces exist Most popular user interfaces are based on the X Window System, often simply called "X" It provides network transparency and permits a graphical application running on one system to be displayed on another where a user may interact with the application; however, certain extensions of the X Window System are not capable of working over the network Several X display servers exist, with the reference implementation, XOrg Server, being the most popular

Several types of window managers exist for X11, including tiling, dynamic, stacking and compositing Window managers provide means to control the placement and appearance of individual application windows, and interact with the X Window System Simpler X window managers such as dwm or ratpoison provide a minimalist functionality, while more elaborate window managers such as FVWM, Enlightenment or Window Maker provide more features such as a built-in taskbar and themes, but are still lightweight when compared to desktop environments Desktop environments include window managers as part of their standard installations, such as Mutter GNOME, KWin KDE or Xfwm xfce, although users may choose to use a different window manager if preferred

Wayland is a display server protocol intended as a replacement for the X11 protocol; as of 2014, it has not received wider adoption Unlike X11, Wayland does not need an external window manager and compositing manager Therefore, a Wayland compositor takes the role of the display server, window manager and compositing manager Weston is the reference implementation of Wayland, while GNOME's Mutter and KDE's KWin are being ported to Wayland as standalone display servers Enlightenment has already been successfully ported since version 19

Video input infrastructure

Main article: Video4Linux

Linux currently has two modern kernel-userspace APIs for handing video input devices: V4L2 API for video streams and radio, and DVB API for digital TV reception

Due to the complexity and diversity of different devices, and due to the large amount of formats and standards handled by those APIs, this infrastructure needs to evolve to better fit other devices Also, a good userspace device library is the key of the success for having userspace applications to be able to work with all formats supported by those devices

Development

Simplified history of Unix-like operating systems Linux shares similar architecture and concepts as part of the POSIX standard but does not share non-free source code with the original Unix or MINIX Main articles: Linux distribution and Free software

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 General Public License 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, LSB, ISO, and ANSI standards where possible, although to date only one Linux distribution has been POSIX1 certified, Linux-FT

Free software projects, although developed through collaboration, 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

Many Linux distributions, or "distros", manage a remote collection of system software and application software packages available for download and installation through a network connection This allows users to adapt the operating system to their specific needs Distributions are maintained by individuals, loose-knit teams, volunteer organizations, and commercial entities 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 Distributions typically use a package manager such as apt, yum, zypper, pacman or portage to install, remove, and update all of a system's software from one central location

Community

See also: Free software community and Linux User 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, and SUSE does with openSUSE

In many cities and regions, local associations known as Linux User 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 LinuxQuestionsorg and the various distribution specific support and community forums, such as ones for Ubuntu, Fedora, and Gentoo 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 bundle cover disks that carry 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 An analysis of the Linux kernel showed 75 percent of the code from December 2008 to January 2010 was developed by programmers working for corporations, leaving about 18 percent to volunteers and 7% unclassified Major corporations that provide contributions include Dell, IBM, HP, Oracle, Sun Microsystems now part of Oracle and Nokia A number of corporations, notably Red Hat, Canonical and SUSE, have built a significant 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 This used to be the norm in the computer industry, with operating systems such as CP/M, Apple DOS and versions of Mac OS prior to 76 freely copyable but not modifiable As computer hardware standardized throughout the 1980s, it became more difficult for hardware manufacturers to profit from this tactic, as the OS would run on any manufacturer's computer that shared the same architecture

Programming on Linux

Linux distributions support dozens of programming languages The original development tools used for building both Linux applications and operating system programs are 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++, Go and Fortran Many programming languages have a cross-platform reference implementation that supports Linux, for example PHP, Perl, Ruby, Python, Java, Go, Rust and Haskell First released in 2003, the LLVM project provides an alternative cross-platform open-source compiler for many languages Proprietary compilers for Linux include the Intel C++ Compiler, Sun Studio, and IBM XL C/C++ Compiler BASIC in the form of Visual Basic is supported in such forms as Gambas, FreeBASIC, and XBasic, and in terms of terminal programming or QuickBASIC or Turbo BASIC programming in the form of QB64

A common feature of Unix-like systems, Linux includes traditional specific-purpose programming languages targeted at scripting, text processing and system configuration and management in general Linux distributions support shell scripts, awk, sed and make Many programs also have an embedded programming language to support configuring or programming themselves For example, regular expressions are supported in programs like grep, or locate, while advanced text editors, like GNU Emacs, have a complete Lisp interpreter built-in

Most distributions also include support for PHP, Perl, Ruby, Python and other dynamic languages While not as common, Linux also supports C# via Mono, Vala, 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 and JikesRVM

GNOME and KDE are popular desktop environments and provide a framework for developing applications 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, CodeLite, Eclipse, Geany, ActiveState Komodo, KDevelop, Lazarus, MonoDevelop, NetBeans, and Qt Creator, while the long-established editors Vim, nano and Emacs remain popular

Hardware support

Linux is ubiquitously found on various types of hardware See also: List of Linux-supported computer architectures

The Linux kernel is a widely ported operating system kernel, available for devices ranging from mobile phones to supercomputers; it runs on a highly diverse range of computer architectures, including the hand-held ARM-based iPAQ and the IBM mainframes System z9 or System z10 Specialized distributions and kernel forks exist for less mainstream architectures; for example, 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 Over time, support for different hardware has improved in Linux, resulting in any off-the-shelf purchase having a "good chance" of being compatible

Uses

See also: Linux range of use

Beside the Linux distributions 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 As of 2015, over four hundred Linux distributions are actively developed, with about a dozen distributions being most popular for general-purpose use

Desktop

Visible software components of the Linux desktop stack include the display server, widget engines, and some of the more widespread widget toolkits There are also components not directly visible to end users, including D-Bus and PulseAudio See also: Desktop environment and Linux adoption: Measuring desktop adoption

The popularity of Linux on standard desktop computers and laptops has been increasing over the years Most modern distributions include a graphical user environment, with, as of February 2015, the two most popular environments being the KDE Plasma Desktop and Xfce

No single official Linux desktop exists: rather desktop environments and Linux distributions select components from a pool of free and open-source software with which they construct a GUI implementing some more or less strict design guide GNOME, for example, has its human interface guidelines as a design guide, which gives the human–machine interface an important role, not just when doing the graphical design, but also when considering people with disabilities, and even when focusing on security

The collaborative nature of free software development allows distributed teams to perform language localization of some 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 became available significantly before Microsoft translated Windows XP into 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

Performance and applications

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 out of frustration with this lack of focus on the desktop, and then gave a "tell all" interview on the topic Since then a significant amount of development has focused on improving the desktop experience Projects such as Upstart and systemd aim for a faster boot time; the Wayland and Mir projects aim at replacing X11 while enhancing desktop performance, security and appearance

Many popular applications are available for a wide variety of operating systems For example, Mozilla Firefox, OpenOfficeorg/LibreOffice and Blender have downloadable versions for all major operating systems Furthermore, some applications initially developed for Linux, such as Pidgin, and GIMP, were ported to other operating systems including Windows and Mac OS X due to their popularity In addition, a growing number of proprietary desktop applications are also supported on Linux, such as Autodesk Maya, Softimage XSI and Apple Shake in the high-end field of animation and visual effects; see the list of proprietary software for Linux for more details There are also several companies that have ported their own or other companies' games to Linux, with Linux also being a supported platform on both the popular Steam and Desura digital-distribution services

Many other types of applications available for Microsoft Windows and Mac OS X also run on Linux Commonly, either a free software application will exist which does the functions of an application found on another operating system, or that application will have a version that works on Linux, such as with Skype and some video games like Dota 2 and Team Fortress 2 Furthermore, the Wine project provides a Windows compatibility layer to run unmodified Windows applications on Linux It is sponsored by commercial interests including CodeWeavers, which produces a commercial version of the software Since 2009, Google has also provided funding to the Wine project CrossOver, a proprietary solution based on the open-source Wine project, 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 In other cases, where there is no Linux port of some software in areas such as desktop publishing and professional audio, there is equivalent software available on Linux

Components and installation

Besides externally visible components, such as X window managers, a non-obvious but quite central role is played by the programs hosted by freedesktoporg, such as D-Bus or PulseAudio; both major desktop environments GNOME and KDE include them, each offering graphical front-ends written using the corresponding toolkit GTK+ or Qt A display server is another component, which for the longest time has been communicating in the X11 display server protocol with its clients; prominent software talking X11 includes the XOrg Server and Xlib Frustration over the cumbersome X11 core protocol, and especially over its numerous extensions, has led to the creation of a new display server protocol, Wayland

Installing, updating and removing software in Linux is typically done through the use of package managers such as the Synaptic Package Manager, PackageKit, and Yum Extender While most major Linux distributions have extensive repositories, often containing tens of thousands of packages, not all the software that can run on Linux is available from the official repositories Alternatively, users can install packages from unofficial repositories, download pre-compiled packages directly from websites, or compile the source code by themselves All these methods come with different degrees of difficulty; compiling the source code is in general considered a challenging process for new Linux users, but it is hardly needed in modern distributions and is not a method specific to Linux

Netbooks

Linux distributions have also become popular in the netbook market, with many devices such as the Asus Eee PC and Acer Aspire One shipping with customized Linux distributions installed

In 2009, Google announced its Chrome OS as a minimal Linux-based operating system, using the Chrome browser as the main user interface Chrome OS does not run any non-web applications, except for the bundled file manager and media player a certain level of support for Android applications was added in later versions The netbooks that shipped with the operating system, termed Chromebooks, started appearing on the market in June 2011

Servers, mainframes and supercomputers

Broad overview of the LAMP software bundle, displayed here together with Squid A high-performance and high-availability web server solution providing security in a hostile environment

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 In June 2008, Linux distributions represented five of the top ten, FreeBSD three of ten, and Microsoft two of ten; since February 2010, Linux distributions represented six of the top ten, FreeBSD two of ten, and Microsoft one of ten

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

Linux distributions have become increasingly popular on mainframes, partly due to pricing and the open-source model In December 2009, computer giant IBM reported that it would predominantly market and sell mainframe-based Enterprise Linux Server At LinuxCon North America 2015, IBM announced LinuxONE, a series of mainframes specifically designed to run Linux and open-source software

Linux distributions are also most commonly used as operating systems for supercomputers; in the decade since the Earth Simulator supercomputer, all the fastest supercomputers have used Linux As of June 2016, 994% 9979% of performance share of the world's 500 fastest supercomputers run some variant of Linux, including the top 280

Smart devices

Android smartphones

Several operating systems for smart devices, such as smartphones, tablet computers, smart TVs, and in-vehicle infotainment IVI systems, are based on Linux Major platforms for such systems include Android, Firefox OS, Mer and Tizen

Android has become the dominant mobile operating system for smartphones, running on 793% of units sold worldwide during the second quarter of 2013 Android is also a popular operating system for tablets, and Android smart TVs and in-vehicle infotainment systems have also appeared in the market

Cellphones and PDAs running Linux on open-source platforms became more common from 2007; examples include the Nokia N810, Openmoko's Neo1973, and the Motorola ROKR E8 Continuing the trend, Palm later acquired by HP produced a new Linux-derived operating system, webOS, which is built into its line of Palm Pre smartphones

Nokia's Maemo, one of the earliest mobile operating systems, was based on Debian It was later merged with Intel's Moblin, another Linux-based operating system, to form MeeGo The project was later terminated in favor of Tizen, an operating system targeted at mobile devices as well as IVI Tizen is a project within The Linux Foundation Several Samsung products are already running Tizen, Samsung Gear 2 being the most significant example Samsung Z smartphones will use Tizen instead of Android

As a result of MeeGo's termination, the Mer project forked the MeeGo codebase to create a basis for mobile-oriented operating systems In July 2012, Jolla announced Sailfish OS, their own mobile operating system built upon Mer technology

Mozilla's Firefox OS consists of the Linux kernel, a hardware abstraction layer, a web-standards-based runtime environment and user interface, and an integrated web browser

Canonical has released Ubuntu Touch, aiming to bring convergence to the user experience on this mobile operating system and its desktop counterpart, Ubuntu The operating system also provides a full Ubuntu desktop when connected to an external monitor

Embedded devices

See also: Embedded Linux and Linux devices The Jolla Phone has the Linux-based Sailfish OS In-car entertainment system of the Tesla Model S is based on Ubuntu Nokia X, a smartphone that runs Linux kernel

Due to its low cost and ease of customization, Linux is often used in embedded systems In the non-mobile telecommunications equipment sector, the majority of customer-premises equipment CPE hardware runs some Linux-based operating system OpenWrt is a community driven example upon which many of the OEM firmwares are based

For example, the popular TiVo digital video recorder also uses a customized Linux, as do several network firewalls and routers from such makers as Cisco/Linksys The Korg OASYS, the Korg KRONOS, the Yamaha Motif XS/Motif XF music workstations, Yamaha S90XS/S70XS, Yamaha MOX6/MOX8 synthesizers, Yamaha Motif-Rack XS tone generator module, and Roland RD-700GX digital piano also run Linux Linux is also used in stage lighting control systems, such as the WholeHogIII console

Gaming

Main article: Linux gaming

There had been several games that run on traditional desktop Linux, and many of which originally written for desktop OS However, due to most game developers not paying attention to such a small market as desktop Linux, only a few prominent games have been available for desktop Linux On the other hand, as a popular mobile platform, Android has gained much developer interest and there are many games available for Android

On February 14, 2013, Valve released a Linux version of Steam, a popular game distribution platform on PC Many Steam games were ported to Linux On December 13, 2013, Valve released SteamOS, a gaming oriented OS based on Debian, for beta testing, and has plans to ship Steam Machines as a gaming and entertainment platform Valve has also developed VOGL, an OpenGL debugger intended to aid video game development, as well as porting its Source game engine to desktop Linux As a result of Valve's effort, several prominent games such as DotA 2, Team Fortress 2, Portal, Portal 2 and Left 4 Dead 2 are now natively available on desktop Linux

On July 31, 2013, Nvidia released Shield as an attempt to use Android as a specialized gaming platform

Specialized uses

Due to the flexibility, customizability and free and open-source nature of Linux, it becomes possible to highly tune Linux for a specific purpose There are two main methods for creating a specialized Linux distribution: building from scratch or from a general-purpose distribution as a base The distributions often used for this purpose include Debian, Fedora, Ubuntu which is itself based on Debian, Arch Linux, Gentoo, and Slackware In contrast, Linux distributions built from scratch do not have general-purpose bases; instead, they focus on the JeOS philosophy by including only necessary components and avoiding resource overhead caused by components considered redundant in the distribution's use cases

Home theater PC

A home theater PC HTPC is a PC that is mainly used as an entertainment system, especially a Home theater system It is normally connected to a television, and often an additional audio system

OpenELEC, a Linux distribution that incorporates the media center software Kodi, is an OS tuned specifically for an HTPC Having been built from the ground up adhering to the JeOS principle, the OS is very lightweight and very suitable for the confined usage range of an HTPC

There are also special editions of Linux distributions that include the MythTV media center software, such as Mythbuntu, a special edition of Ubuntu

Digital security

Kali Linux is a Debian-based Linux distribution designed for digital forensics and penetration testing It comes preinstalled with several software applications for penetration testing and identifying security exploits The Ubuntu derivative BackBox provides pre-installed security and network analysis tools for ethical hacking

There are many Linux distributions created with privacy, secrecy, network anonymity and information security in mind, including Tails, Tin Hat Linux and Tinfoil Hat Linux Lightweight Portable Security is a distribution based on Arch Linux and developed by the United States Department of Defense Tor-ramdisk is a minimal distribution created solely to host the network anonymity software Tor

System rescue

Linux Live CD sessions have long been used as a tool for recovering data from a broken computer system and for repairing the system Building upon that idea, several Linux distributions tailored for this purpose have emerged, most of which use GParted as a partition editor, with additional data recovery and system repair software:

  • GParted Live – a Debian-based distribution developed by the GParted project
  • Parted Magic – a commercial Linux distribution
  • SystemRescueCD – a Gentoo-based distribution with support for editing Windows registry

In space

SpaceX uses multiple redundant flight computers in a fault-tolerant design in the Falcon 9 rocket Each Merlin engine is controlled by three voting computers, with two physical processors per computer that constantly check each other's operation Linux is not inherently fault-tolerant no operating system is, as it is a function of the whole system including the hardware, but the flight computer software makes it so for its purpose For flexibility, commercial off-the-shelf parts and system-wide "radiation-tolerant" design are used instead of radiation hardened parts As of June 2015, SpaceX has made 19 launches of the Falcon 9 since 2010, out of which 18 have successfully delivered their primary payloads to Earth orbit, including some support missions for the International Space Station

In addition, Windows was used as an operating system on non-mission critical systems—​​laptops used on board the space station, for example—​​but it has been replaced with Linux; the first Linux-powered humanoid robot is also undergoing in-flight testing

The Jet Propulsion Laboratory has used Linux for a number of years "to help with projects relating to the construction of unmanned space flight and deep space exploration"; NASA uses Linux in robotics in the Mars rover, and Ubuntu Linux to "save data from satellites"

Education

Linux distributions have been created to provide hands-on experience with coding and source code to students, on devices such as the Raspberry Pi In addition to producing a practical device, the intention is to show students "how things work under the hood"

The Ubuntu derivatives Edubuntu and The Linux Schools Project, as well as the Debian derivative Skolelinux, provide education-oriented software packages They also include tools for administering and building school computer labs and computer-based classrooms, such as the Linux Terminal Server Project LTSP

Others

Instant WebKiosk and Webconverger are browser-based Linux distributions often used in web kiosks and digital signage Thinstation is a minimalist distribution designed for thin clients Rocks Cluster Distribution is tailored for high-performance computing clusters

There are general-purpose Linux distributions that target a specific audience, such as users of a specific language or geographical area Such examples include Ubuntu Kylin for Chinese language users and BlankOn targeted at Indonesians Profession-specific distributions include Ubuntu Studio for media creation and DNALinux for bioinformatics There is also a Muslim-oriented distribution of the name Sabily, as well as an Arabic-focused distribution called Ojuba Linux that consequently also provides some Islamic tools Certain organizations use slightly specialized Linux distributions internally, including GendBuntu used by the French National Gendarmerie, Goobuntu used internally by Google, and Astra Linux developed specifically for the Russian army

Market share and uptake

Main article: Linux adoption See also: Usage share of operating systems

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 $357 billion by 2008 Analysts and proponents attribute the relative success of Linux to its security, reliability, low cost, and freedom from vendor lock-in

Desktops and laptops According to web server statistics, as of June 2016, the estimated market share of Linux on desktop computers is around 18% In comparison, Microsoft Windows has a market share of around 897%, while Mac OS covers around 85% Web servers W3Cook publishes stats that use the top one million Alexa domains, which as of May 2015 estimate that 9655% of web servers run Linux, 173% run Windows, and 172% run FreeBSD W3Techs publishes stats that use the top ten million Alexa domains, which is updated every month and as of May 2015 estimates that 326% of web servers run Windows, with the rest being Linux or Unix IDC's Q1 2007 report indicated that Linux held 127% 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 that had Linux installed on it later In September 2008, Microsoft's CEO Steve Ballmer stated that 60% of web servers ran Linux, versus 40% that ran Windows Server Mobile devices Android, which is based on the Linux kernel, has become the dominant operating system for smartphones During the second quarter of 2013, 793% of smartphones sold worldwide used Android Android is also a popular operating system for tablets, being responsible for more than 60% of tablet sales as of 2013 According to web server statistics, as of December 2014 Android has a market share of about 46%, with iOS holding 45%, and the remaining 9% attributed to various niche platforms Film production For years Linux has been the platform of choice in the film industry The first major film produced on Linux servers was 1997's Titanic Since then major studios including DreamWorks Animation, Pixar, Weta Digital, and Industrial Light & Magic have migrated to Linux According to the Linux Movies Group, more than 95% of the servers and desktops at large animation and visual effects companies use Linux Use in government Linux distributions 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 its own Linux distribution has also surfaced, and has come to fruition as the GHost Project The Indian state of Kerala has gone to the extent of mandating that all state high schools 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 toward the adoption of Linux North Korea's Red Star OS, developed since 2002, is based on a version of Fedora Linux

Copyright, trademark, and naming

See also: GNU/Linux naming controversy and SCO-Linux controversies

Linux kernel is licensed under the GNU General Public License GPL, version 2 The GPL requires that anyone who distributes software based on source code under this license, must make the originating source code and any modifications available to the recipient under the same terms Other key components of a typical Linux distribution are also mainly licensed under the GPL, but they may use other licenses; many libraries use the GNU Lesser General Public License LGPL, a more permissive variant of the GPL, and the Xorg implementation of 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 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 71 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 $149 billion 2016 US dollars to develop in the United States Most of the source code 71% was written in the C programming language, but many other languages were used, including C++, Lisp, 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 24 million lines of code, or 8% of the total

In a later study, the same analysis was performed for Debian version 40 etch, which was released in 2007 This distribution contained close to 283 million source lines of code, and the study estimated that it would have required about seventy three thousand man-years and cost US$82 billion in 2016 dollars to develop by conventional means

The name "Linux" is also used for a laundry detergent made by Swiss company Rösch

In the United States, the name Linux is a trademark registered to Linus Torvalds Initially, nobody registered it, but on August 15, 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 LMI 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

The Free Software Foundation FSF prefers GNU/Linux as the name when referring to the operating system as a whole, because it considers Linux distributions to be variants of the GNU operating system, initiated in 1983 by Richard Stallman, president of the FSF

A minority of public figures and software projects other than Stallman and the FSF, notably Debian which had been sponsored by the FSF up to 1996, also use GNU/Linux when referring to the operating system as a whole Most media and common usage, however, refers to this family of operating systems simply as Linux, as do many large Linux distributions for example, SUSE Linux and Red Hat Enterprise Linux As of May 2011, about 8% to 13% of a modern Linux distribution is made of GNU components the range depending on whether GNOME is considered part of GNU, as determined by counting lines of source code making up Ubuntu's "Natty" release; meanwhile, about 9% is taken by the Linux kernel

See also

  • Free software portal
  • Linux portal
  • Open-source software portal
  • Comparison of Linux distributions
  • Comparison of open source and closed source
  • Comparison of operating systems
  • Comparison of X Window System desktop environments
  • Criticism of Linux
  • Linux Documentation Project
  • Linux Foundation
  • List of Linux distributions
  • List of games released on Linux
  • List of operating systems
  • Loadable kernel module
  • Usage share of operating systems

Notes

  1. ^ GNU is the primary userland used in nearly all Linux distros The GNU userland contains system daemons, user applications, the GUI, and various libraries GNU Core utilities are an essential part of most distros Most Linux distributions use the X Window system Other components of the userland, such as the widget toolkit, vary with the specific distribution, desktop environment, and user configuration
  2. ^ "Linux" trademark is owned by Linus Torvalds and administered by the Linux Mark Institute

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  155. ^ a b c Wheeler, David A July 29, 2002 "More Than a Gigabuck: Estimating GNU/Linux's Size" Retrieved May 11, 2006 
  156. ^ Amor, Juan José; et al June 17, 2007 "Measuring Etch: the size of Debian 40" Retrieved September 16, 2007 
  157. ^ "There Is a Linux Detergent Out There and It's Trademarked" Linuxcom June 19, 2015 Retrieved January 31, 2016 
  158. ^ "Linux Timeline" Linux Journal May 31, 2006 
  159. ^ Neil McAllister September 5, 2005 "Linus gets tough on Linux trademark" InfoWorld Archived from the original on April 12, 2008 Retrieved February 24, 2008 
  160. ^ "Linux Mark Institute" Retrieved February 24, 2008 LMI has restructured its sublicensing program Our new sublicense agreement is: Free – approved sublicense holders pay no fees; Perpetual – sublicense terminates only in breach of the agreement or when your organization ceases to use its mark; Worldwide – one sublicense covers your use of the mark anywhere in the world 
  161. ^ Richard Stallman April 28, 1996 "The FSF is no longer sponsoring Debian" tech-insiderorg Retrieved February 8, 2014 
  162. ^ "About Debian" debianorg December 8, 2013 Retrieved January 30, 2014 
  163. ^ Andrew D Balsa; Coauthors "The linux-kernel mailing list FAQ" The Linux Kernel Archives Kernelorg Archived from the original on October 1, 2012 Retrieved June 13, 2013 we have tried to use the word "Linux" or the expression "Linux kernel" to designate the kernel, and GNU/Linux to designate the entire body of GNU/GPL'ed OS software, many people forget that the linux kernel mailing list is a forum for discussion of kernel-related matters, not GNU/Linux in general 
  164. ^ Côrte-Real, Pedro May 31, 2011 "How much GNU is there in GNU/Linux" Split Perspective Retrieved January 28, 2014  self-published data

External links

  • Linux at DMOZ
  • Graphical map of Linux Internals
  • Linux kernel website and archives
  • The History of Linux in GIT Repository Format 1992–2010

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