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Many other open-source software projects contribute to Linux systems. Installed components of a Linux system include the following: [78] [80]. The user interface , also known as the shell , is either a command-line interface CLI , a graphical user interface GUI , or controls attached to the associated hardware, which is common for embedded systems. For desktop systems, the default user interface is usually graphical, although the CLI is commonly 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. 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. 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. Org Server , being the most popular. Server distributions might provide a command-line interface for developers and administrators, but provide a custom interface towards end-users, designed for the use-case of the system.

This custom interface is accessed through a client that resides on another system, not necessarily Linux based. 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 , ratpoison , i3wm , or herbstluftwm 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.

Wayland is a display server protocol intended as a replacement for the X11 protocol; as of [update] , 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. Enlightenment has already been successfully ported since version Due to the complexity and diversity of different devices, and due to the large number 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. 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. Linux-based distributions are intended by developers for interoperability with other operating systems and established computing standards.

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 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. 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.

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.

Online forums are another means for support, with notable examples being LinuxQuestions. 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. 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 to sell hardware.

As computer hardware standardized throughout the s, 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. Most programming languages support Linux either directly or through third-party community based ports.

First released in , the LLVM project provides an alternative cross-platform open-source compiler for many languages. 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 and locate , the traditional Unix MTA Sendmail contains its own Turing complete scripting system, and the advanced text editor GNU Emacs is built around a general purpose Lisp interpreter. Guile Scheme acts as an extension language targeting the GNU system utilities, seeking to make the conventionally small, static , compiled C programs of Unix design rapidly and dynamically extensible via an elegant, functional high-level scripting system; many GNU programs can be compiled with optional Guile bindings to this end.

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. 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 z 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. In , a new initiative was launched to automatically collect a database of all tested hardware configurations. 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.

Torvalds states that the Linux kernel will not move from version 2 of the GPL to version 3. A study of Red Hat Linux 7. Slightly over half of all lines of code were licensed under the GPL. The Linux kernel itself was 2. In a later study, the same analysis was performed for Debian version 4. Della Croce, Jr. In , Torvalds and some affected organizations sued him to have the trademark assigned to Torvalds, and, in , the case was settled. 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. From Wikipedia, the free encyclopedia.

This is the latest accepted revision , reviewed on 9 August This article is about the family of operating systems. For the kernel, see Linux kernel. For other uses, see Linux disambiguation. Family of Unix-like operating systems. Tux the penguin, mascot of Linux [1]. Main article: History of Linux. Main article: Linux adoption. Main article: Video4Linux. Main articles: Linux distribution and Free software.

See also: Free software community and Linux User Group. See also: List of Linux-supported computer architectures. Main article: Linux range of use. See also: Usage share of operating systems. Free and open-source software portal Linux portal. GNU Core utilities are an essential part of most distributions. Most Linux distributions use the X Window system.

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