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Linux

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Linux
Tux the penguin, mascot of Linux
Tux the penguin, based oan a pictur creatit by Larry Ewing in 1996, is the logo and mascot of Linux.
OS faimilyUnix-like
Wirkin stateCurrent
Latest release2.6.18.1 (kernel) / October 14 2006
Kernel typeMonolithic kernel
LicenseGNU General Public License

Linux (also kent as GNU/Linux) is a Unix-like computer operatin seestem. It is ane of the maist prominent examples o open source development an free saftware; unlike proprietary operatin seestems sic as Microsoft Windaes or Mac OS X, its unnerlyin source code is available for onywan to yaise, chynge, an redistribute fir nay chairge.

First developit an yaised mainly by single enthusiasts on personal computers, Linux has noo gained the support o muckle companies sic as IBM, Sun Microsystems, Hewlett-Packard, an Novell, Inc., an has risen to prominence as an operating seestem for servers; eight of the ten most reliable internet hosting companies now run Linux on their web servers.[1]

Linux has been mair widely portit to deifferent computin platforms than ony ither operating seestem. It is yaised in devices rangin frae supercomputers tae mobile phones, and is gaining popularity in the personal computer mercat.[2]

History

Linus Torvalds, creator of the Linux kernel.

In 1983, Richard Stallman foondit the GNU Project, wi the goal o developin a complete Unix-like operatin seestem composed entirely o free saftware. By the stert o the 1990s, GNU had creatit or collectit maist o the necessar components o this seestem — libraries, compilers, text editors, a Unix shell — except for the core component, the kernel. The GNU project stertit developin a kernel, the GNU Hurd, in 1990, based oan the Mach microkernel, but the development of this Mach-based design has proven gey hard and proceedit slowly.

Meanwhile, in 1991, another kernel was begun as a hobby by Finnish university student Linus Torvalds while attending the University of Helsinki.[3] Torvalds originally yaised Minix oan his ain computer, a simplified Unix-like system writin by Andrew Tanenbaum fur learnin operatin seestem design. Foreby Tanenbaum did nae allow ithers to extend his operatin seestem, leadin Torvalds to big a replacement fur Minix.

Originally, Torvalds called his kernel "Freax" for "free" and "freak" and with the often-used X in the names of Unix-like systems. The name "Linux" was coined by Ari Lemmke, who administered an FTP server belonging to the Finnish University Network; he invented the name Linux for the directory from which Torvalds' project was first available for download.[4]

A graphic history of Unix systems. Linux is a Unix-type system but its source code does not descend from the original Unix.

At first a computer running Minix was necessary in order to configure and install Linux. Initial versions of Linux also required another operating system to be present in order to boot from a hard disk, but soon there were independent boot loaders such as LILO. The Linux system quickly surpassed Minix in functionality; Torvalds and other early Linux kernel developers adapted their work for the GNU components and user-space programs to create a complete, fully functional, and free operating system.

Today, Torvalds continues to direct the development of the kernel, while other subsystems such as the GNU components continue to be developed separately (Linux kernel development is not part of the GNU Project). Other groups and companies combine and distribute these components with additional application software in the form of Linux distributions.

Portability

see also: Linux (kernel) / Portability

The Linux kernel was originally designed only for Intel 80386 microprocessors, but now supports a wide variety of computer architectures. Linux is one of the most widely ported operating systems, running on a diverse range of systems from the hand-held ARM-based iPAQ to the mainframe IBM System z9. Specialized distributions exist for less mainstream architectures.

Copyright, licensing, and the Linux trademark

The Linux kernel and most GNU software are licensed under the GNU General Public License. The GPL requires that all distributed source code modifications and derived works also be licensed under the GPL, and is sometimes referred to as a "share and share-alike" or "copyleft" license. In 1997, Linus Torvalds stated, "Making Linux GPL'd was definitely the best thing I ever did."[5] Other software 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.

In the United States, the name Linux is a trademark[6] 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 to have the trademark assigned to Torvalds, and in 1997 the case was settled[7]. The licensing of the trademark is now handled by the Linux Mark Institute. Torvalds has stated that he only trademarked the name to prevent someone else from using it, but was bound in 2005 by United States trademark law to take active measures to enforce the trademark. As a result, the LMI sent out a number of letters to distribution vendors requesting that a fee be paid for the use of the name, and a number of companies have complied.[8]

Pronunciation

In 1992, Torvalds explained how he pronounces the word Linux:

'li' is pronounced with a short [ee] sound: compare prInt, mInImal etc. 'nux' is also short, non-diphthong, like in pUt {IPA /ʊ/}. It's partly due to minix: linux was just my working name for the thing, and as I wrote it to replace minix on my system, the result is what it is... linus' minix became linux.

— Linus Torvalds, comp.os.linux newsgroup[4]

An audio file of Torvalds saying "Hello, this is Linus Torvalds, and I pronounce Linux as Linux" can be found here. Note that in English, "Linux" and "Minix" are usually pronounced with a short i (IPA: /ɪ/) sound that is different from Torvalds' Finland-Swedish pronunciation of these words, similar to the difference between the Finland-Swedish and English pronunciations of "Linus."

Linux and the GNU Project

File:Richard Matthew Stallman.jpeg
Richard Stallman, founder of the GNU project for a free operating system.

The goal of the GNU project is to produce a Unix-compatible operating system consisting entirely of free software, and most general-purpose Linux distributions rely on GNU libraries and tools written to that effect. The Free Software Foundation views these Linux distributions as "variants" of the GNU system, and asks that such operating systems be referred to as GNU/Linux or a Linux-based GNU system. While some distributions make a point of using the combined form - notably Debian GNU/Linux - its use outside of the enthusiast community is limited, and Linus Torvalds has said that he finds calling Linux in general GNU/Linux "just ridiculous" [9]. The distinction between the Linux kernel and distributions based on it is a source of confusion to many newcomers, and the naming remains controversial.

SCO litigation

In March 2003, the SCO Group filed a lawsuit against IBM, claiming that IBM had contributed portions of SCO's copyrighted code to the Linux kernel in violation of IBM's license to use Unix. Additionally, SCO sent letters to a number of companies warning that their use of Linux without a license from SCO may be actionable, and claimed in the press that they would be suing individual Linux users. This controversy has involved lawsuits by SCO against DaimlerChrysler (dismissed in 2004), and AutoZone, and by Red Hat and others against SCO. Furthermore, whether SCO even owns the relevant Unix copyrights is currently disputed by Novell.

As per the Utah District Court ruling on July 3, 2006; 182 claims out of 294 claims made by SCO against IBM have been dismissed.[10]

SCO's claims have varied widely. As of 2006, no proof of SCO's claims of copied code in Linux has been provided.

Development

More Than a Gigabuck: Estimating GNU/Linux's Size, a 2001 study of Red Hat Linux 7.1, found that this distribution contained 30 million source lines of code.[11] 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 1.08 billion dollars (year 2000 U.S. dollars) to develop in the United States.

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

In a later study, Counting potatoes: The size of Debian 2.2, the same analysis was performed for Debian GNU/Linux version 2.2.[12] This distribution contained over fifty-five million source lines of code, and the study estimated that it would have cost 1.9 billion dollars (year 2000 U.S. dollars) to develop by conventional means.

Applications

A KDE desktop on the SUSE distribution.

Linux has historically been used mainly as a server operating system, but its low cost, flexibility, and Unix background make it suitable for a wide range of applications. Linux is 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.

Due to its low cost and its high configurability, Linux is often used in embedded systems such as television set-top boxes, mobile phones, and handheld devices. Linux has become a major competitor to the proprietary Symbian OS found in many mobile phones, and it is an alternative to the dominant Windows CE and Palm OS operating systems on handheld devices. The popular TiVo digital video recorder uses a customized version of Linux. Several network firewall and router standalone products, including several from Linksys, use Linux internally, using its advanced firewalling and routing capabilities.

Linux is increasingly common as an operating system for supercomputers. In the November 2005 TOP500 list of supercomputers, the two fastest supercomputers in the world ran Linux. Of the 500 systems, 371 (74.2%) ran some version of Linux, including seven of the top ten.

The Sony PlayStation 3 video game console, scheduled to be released in November 2006, will run Linux by default. Sony has previously released a PS2 Linux do-it-yourself kit for their PlayStation 2 video game console. Game developers like Atari and id Software have released titles to the Linux desktop. Linux Game Publishing also produces games for Linux, licensing and porting them from their Windows source code.

The One Laptop Per Child project, which aims to provide computing devices to all children in developing nations, uses Linux as the devices' operating system.

Distributions

Linux is predominantly used as part of a Linux distribution (commonly called a "distro"). These are compiled by individuals, loose-knit teams, and commercial and volunteer organizations. They commonly include additional system and application software, an installer system to ease initial system setup, and integrated management of software installation and upgrading. Distributions are created for many different purposes, including computer architecture support, localization to a specific region or language, real-time applications, and embedded systems, and many 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.[13]

A typical general-purpose distribution includes the Linux kernel, some GNU libraries and tools, command-line shells, the graphical X Window System and an accompanying desktop environment such as KDE or GNOME, together with thousands of application software packages, from office suites to compilers, text editors, and scientific tools.

Desktop usage

A GNOME desktop running from the GNOME LiveCD.

The high level of access granted to Linux's internals has led to Linux users traditionally tending to be more technologically oriented than users of Microsoft Windows and Mac OS, sometimes revelling in the tag of "hacker" or "geek". Linux and other free software projects have been frequently criticized for not going far enough to ensure ease of use.[citation needit]

This stereotype has begun to be dispelled in recent years. Linux may now be used with a user interface that is very similar to those running on other operating systems. Users may have to switch application software, and there are often fewer "known" options (as in the case of computer games) but there exist replacements for all general-purpose software, and general applications like spreadsheets, word processors, and browsers are available for Linux in profusion. Additionally, a growing number of proprietary software vendors are supporting Linux,[14] and compatibility layers such as the Wine system allow some Windows application software and drivers to be used on Linux without requiring the vendor to adapt them.

Linux's roots in the Unix operating system mean that in addition to graphical configuration tools and control panels available for many system settings and services, plain-text configuration files are still commonly used to configure the OS and can readily be made accesible (or not) to users, at the administrator's will.

The Berlin-based organization Relevantive concluded in 2003 that the usability of Linux for a set of desktop-related tasks was "nearly equal to Windows XP."[15] Since then, there have been numerous independent studies and articles which indicate that a modern Linux desktop using either GNOME or KDE is on par with Microsoft Windows in a business setting.[16]

Market share and uptake

According to the market research company IDC, 25% of servers and 2.8% of desktop computers ran Linux as of 2004.[17] Proponents and analysts attribute the success of Linux to its security, reliability,[18] low cost, and freedom from vendor lock-in,[19]. The frictional cost of switching and lack of support for some hardware and many application programs designed for Windows, especially games or uncommon business software, are two important factors inhibiting adoption.

The Linux market is rapidly growing and the revenue of servers, desktops, and packaged software running Linux is expected to exceed $35.7 billion by 2008.[20] The actual installed user base may be higher than indicated by this figure, as most Linux distributions and applications are freely available and redistributable.

The paper Why Open Source Software / Free Software (OSS/FS)? Look at the Numbers![21] identifies many quantitative studies of open source software, on topics including market share and reliability, with many studies specifically examining Linux.

Installation

The most common method of installing Linux on a personal computer is by booting from a CD-ROM that contains the installation program and installable software. Such a CD can be burned from a downloaded ISO image, purchased alone for a low price, can be obtained as part of a box set that may also include manuals and additional commercial software and in a few cases shipped for free by request. Mini CD images allow Linux to be installed from a disk with a small form factor.

As with servers, personal computers that come with Linux already installed are available from vendors including Hewlett-Packard and Dell, although generally only for their business desktop line.

Alternatives to traditional desktop installation include thin client installation, where the operating system is loaded and run from a centralised machine over a network connection; and running from a Live CD, where the computer boots the entire operating system from CD without first installing it on the computer's hard disk.

On embedded devices, Linux is typically held in the device's firmware and may or may not be consumer-accessible.

Programming on Linux

The GNU Compiler Collection (GCC) is the standard compiler family for most Linux systems. Amongst others, GCC provides frontends for C, C++ and Java. Most distributions come installed with interpreters for Perl, Python and other scripting languages, and several now include C# via the Mono project.

There are a number of Integrated development environments available including KDevelop, Anjuta, NetBeans, and Eclipse while the traditional editors Emacs and Vim remain popular.[citation needit]

The two main widget toolkits used for contemporary GUI programming are Qt and the Gimp Toolkit, known as GTK+.

As well as these free and open source options, there are proprietary compilers and tools available from a range of companies such as Intel,[22] PathScale[23] and the Portland Group.[24]

Support

Technical support is provided by commercial suppliers and by other Linux users, usually in online forums, IRC, newsgroups, and mailing lists. Linux User Groups have traditionally been organized to provide support for Linux in specific cities and regions.

The business model of commercial suppliers is generally dependent on charging for support, especially for business users. A number of companies 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.

See also

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References

  • Torvalds, Linus, and David Diamond. Just for Fun: The Story of an Accidental Revolutionary. Harper-Collins Business.
  • Moody, Glyn. Rebel Code: Linux and the Open Source Revolution. Perseus Publishing. ISBN 0-713-99520-3.
  • Gedda, R (2004). "Linux breaks desktop barrier in 2004: Torvalds". Retrieved 16 Januar 2004.
  • Mackenzie, K (2004). "Linux Torvalds Q&A". Retrieved 19 Januar 2004.
  • Greene, Thomas C. "Mandrake 8.1 easier than Win-XP". The Register. Retrieved 22 December 2005.
  1. http://news.netcraft.com/archives/2006/10/07/rackspace_most_reliable_hoster_in_september.html
  2. Burke, Steven (2006-03-20). "Red Hat looks to boost channel sales". CRN. Retrieved 2006-04-01. Check date values in: |date= (help)
  3. Torvalds, Linux. "What would you like to see most in minix?". Usenet: comp.os.minix. Retrieved 2006-09-09 from [1]
  4. a b Torvalds, Linus. "How to pronounce "Linux"?". Usenet: comp.os.linux. Retrieved 2006-08-08 from [2]
  5. "Linus Torvalds interview". Retrieved 8 Mey 2006.
  6. "U.S. Reg No: 1916230". Retrieved 1 Apryle 2006.
  7. "Linux Journal, 2006-06-31, Linux Timeline".
  8. "Linus gets tough on Linux trademark". Unknown parameter |accessdte= ignored (|access-date= suggested) (help)
  9. Moore, J.T.S. (Produced, Written, and Directed) (2001). Revolution OS (DVD).
  10. "SCO Losing Linux Battle With IBM".
  11. Wheeler, David A (29 Julie 2002). "More Than a Gigabuck: Estimating GNU/Linux's Size". Retrieved 11 Mey 2006.
  12. González-Barahona, Jesús M (3 Januar 2002). "Counting potatoes: The size of Debian 2.2". Retrieved 11 Mey 2006. Unknown parameter |coauthors= ignored (|author= suggested) (help)
  13. "The LWN.net Linux Distribution List". Retrieved 19 Mey 2006.
  14. "The Global Desktop Project, Building Technology and Communities". Retrieved 7 Mey 2006.
  15. "Relevantive Linux usability study". Retrieved 3 Apryle 2006.
  16. Dulaney, Emmett (Juin 2005). "Desktop Linux: Ready for Prime Time?". Retrieved 19 Juin 2006.
  17. White, Dominic (2 Apryle 2004). "Microsoft eyes up a new kid on the block". The Daily Telegraph. Retrieved 9 September 2006.
  18. "Why customers are flocking to Linux".
  19. "The rise and rise of Linux".
  20. "Linux To Ring Up $35 Billion By 2008". Retrieved 1 Apryle 2006.
  21. Wheeler, David A. "Why Open Source Software / Free Software (OSS/FS)? Look at the Numbers!". Retrieved 1 Apryle 2006.
  22. http://www.intel.com/cd/software/products/asmo-na/eng/linux/index.htm
  23. http://www.pathscale.com/ekopath.html
  24. http://www.pgroup.com/

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