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In 1984, AT&T divested itself of its regional operating companies, and was released from its obligation not to enter the computer business freed of that obligation, Bell Labs began selling Unix as a proprietary product, where users were not legally allowed to modify it. As a result, Unix grew quickly and became widely adopted by academic institutions and businesses.

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ĭue to an earlier antitrust case forbidding it from entering the computer business, AT&T licensed the operating system's source code as a trade secret to anyone who asked. The availability of a high-level language implementation of Unix made its porting to different computer platforms easier. In 1973, in a key pioneering approach, it was rewritten in the C programming language by Dennis Ritchie (with the exception of some hardware and I/O routines). First released in 1971, Unix was written entirely in assembly language, as was common practice at the time. The Unix operating system was conceived and implemented in 1969, at AT&T's Bell Labs, in the United States by Ken Thompson, Dennis Ritchie, Douglas McIlroy, and Joe Ossanna. Linus Torvalds, principal author of the Linux kernel The Linux kernel, for example, is licensed under the GPLv2, with a special exception for system calls, as without the system call exception any program calling on the kernel would be considered a derivative and therefore the GPL would have to apply to that program.

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The 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 (GPL).

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Linux is one of the most prominent examples of free and open-source software collaboration. This includes routers, automation controls, smart home devices, video game consoles, televisions (Samsung and LG Smart TVs use Tizen and WebOS, respectively), automobiles (Tesla, Audi, Mercedes-Benz, Hyundai, and Toyota all rely on Linux), spacecraft ( Falcon 9's and Dragon 2's avionics use a customized version of Linux), and rovers (the Mars 2020 mission). devices whose operating system is typically built into the firmware and is highly tailored to the system.

Linux also runs on embedded systems, i.e. Linux is the leading operating system on servers (over 96.4% of the top 1 million web servers' operating systems are Linux), leads other big iron systems such as mainframe computers, and is the only OS used on TOP500 supercomputers (since November 2017, having gradually eliminated all competitors). Although Linux is, as of May 2022, used by only around 2.3 percent of desktop computers, the Chromebook, which runs the Linux kernel-based Chrome OS, dominates the US K–12 education market and represents nearly 20 percent of sub-$300 notebook sales in the US.

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Because of the dominance of the Linux-based Android on smartphones, Linux, including Android, has the largest installed base of all general-purpose operating systems, as of May 2022. Linux was originally developed for personal computers based on the Intel x86 architecture, but has since been ported to more platforms than any other operating system. Because Linux is freely redistributable, anyone may create a distribution for any purpose. Distributions intended for servers may omit graphics altogether, or include a solution stack such as LAMP. Desktop Linux distributions include a windowing system such as X11 or Wayland, and a desktop environment such as GNOME or KDE Plasma. Commercial distributions include Red Hat Enterprise Linux and SUSE Linux Enterprise.

Popular Linux distributions include Debian, Fedora Linux, and Ubuntu, which in itself has many different distributions and modifications, including Lubuntu and Xubuntu. Many Linux distributions use the word 'Linux' in their name, but the Free Software Foundation uses the name ' GNU/Linux' to emphasize the importance of GNU software, causing some controversy. Linux is typically packaged as a Linux distribution.ĭistributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Linux ( / ˈ l iː n ʊ k s/ ( listen) LEE-nuuks or / ˈ l ɪ n ʊ k s/ LIN-uuks) is an open-source Unix-like operating system based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds.

GPLv2 and others (the name 'Linux' is a trademark )

Most distributions include a desktop environment ( GUI).

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