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  1. 1. Professional Operating System
  2. 2. History of LinuxThe History of Linux began in 1991 with the commencement of a personal project bya Finnish student, Linus Torvalds, to create a new operating system kernel.Since then, the resulting Linux kernel has been marked by constant growth throughoutits history. Since the initial release of its source code in 1991, it has grown from a smallnumber of C files under a license prohibiting commercial distribution to its state in2009 of over 370 megabytes of source under the GNU General Public License.Events leading to creationThe Unix operating system was conceived and implemented by KenThompson and Dennis Ritchie (both of AT&T Bell Laboratories) in 1969 andfirst released in 1970. Its availability and portability caused it to be widelyadopted, copied and modified by academic institutions and businesses. Itsdesign became influential to authors of other systems.
  3. 3. Ken Thompson and Dennis RitchieIn 1983, Richard Stallman started the GNU projectwith the goal of creating a free UNIX-likeoperating system.As part of this work, he wrotethe GNU General Public License (GPL). By theearly 1990s there was almost enough availablesoftware to create a full operating system.However, the GNU kernel, called Hurd, failed toattract enough attention from developers leavingGNU incomplete.Another free operating system project, initially released in1977, was the Berkeley Software Distribution (BSD). This wasdeveloped by UC Berkeley from the 6th edition of Unix from AT&T.Since BSD contained Unix code that AT&T owned, AT&T filed alawsuit (USL v. BSDi) in the early 1990s against the University ofCalifornia. This strongly limited the development and adoption ofBSD.
  4. 4. In 1985, Intel released the 80386, the first x86 microprocessor with 32-bitinstruction set and MMU with paging.In 1986, Maurice J. Bach, of AT&T Bell Labs, published The Design of the UNIXOperating System. This definitive description principally covered the System VRelease 2 kernel, with some new features from Release 3 and BSD.MINIX, a Unix-like system intended for academic use, was released byAndrew S. Tanenbaum in 1987. While source code for the system wasavailable, modification and redistribution were restricted. Inaddition, MINIXs 16-bit design was not well adapted to the 32-bitfeatures of the increasingly cheap and popular Intel 386 architecture forpersonal computers.These factors and the lack of a widely adopted, free kernel provided theimpetus for Torvaldss starting his project. He has stated that if eitherthe GNU or 386BSD kernels were available at the time, he likely wouldnot have written his own.
  5. 5. The creation of LinuxLinus Torvalds in 2002In 1991, in Helsinki, Linus Torvalds began a project that laterbecame the Linux kernel. It was initially a terminalemulator, which Torvalds used to access the large UNIX servers ofthe university. He wrote the program specifically for the hardwarehe was using and independent of an operating system because hewanted to use the functions of his new PC with an 80386processor. Development was done on MINIX using the GNU Ccompiler, which is still the main choice for compiling Linux today(although the code can be built with other compilers, such as theIntel C Compiler).As Torvalds wrote in his book Just for Fun, he eventuallyrealized that he had written an operating system kernel. On 25August 1991, he announced this system in a Usenet posting tothe newsgroup "comp.os.minix.“.
  6. 6. Hello everybody out there using minix –Im doing a (free) operating system (just a hobby, wont be bigand professional like gnu) for 386(486) AT clones. This has beenbrewing since april, and is starting to get ready. Id like anyfeedback on things people like/dislike in minix, as my OSresembles it somewhat (same physical layout of the file-system(due to practical reasons) among other things).Ive currently ported bash(1.08) and gcc(1.40), and things seemto work. This implies that Ill get something practical within a fewmonths, and Id like to know what features most people wouldwant. Any suggestions are welcome, but I wont promise Illimplement them :-)Linus ( Yes – its free of any minix code, and it has a multi-threadedfs. It is NOT portable (uses 386 task switching etc), and itprobably never will support anything other than AT-hard disks, asthats all I have :-(.—LinusTorvalds
  7. 7. The name :-Floppy discs holding a very early version of LinuxLinus Torvalds had wanted to call his invention Freax, a portmanteauof "freak", "free", and "x" (as an allusion to Unix). During the start ofhis work on the system, he stored the files under the name "Freax"for about half of 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 theFTP server ( of FUNET in September 1991. AriLemmke, Torvalds coworker at the Helsinki University of Technology(HUT) who was one of the volunteer administrators for the FTPserver at the time, did not think that "Freax" was a good name.So, he named the project "Linux" on the server without consultingTorvalds.Later, however, Torvalds consented to "Linux".To demonstrate how the word "Linux" should be pronouncedTorvalds included an audio guide with the kernel source code.
  8. 8. "Linux is obsolete"In 1992 Andrew S. Tanenbaum, recognized computer scientist and author of the Minixmicrokernel system, wrote a Usenet article on the newsgroup comp.os.minix with the title"Linux is obsolete",which marked the beginning of a famous debate about the structure of thethen-recent Linux kernel. Among the most significant criticisms were that:The kernel was monolithic and thus old-fashioned.The lack of portability, due to the use of exclusive features of the Intel 386 processor. "Writing anew operating system that is closely tied to any particular piece of hardware, especially a weirdone like the Intel line, is basically wrong."There was no strict control of the source code by any individual person.Linux employed a set of features which were useless (Tanenbaum believedthat multithreaded file systems were simply a "performance hack").Tanenbaums prediction that Linux would become outdated within a few yearsand replaced by GNU Hurd (which he considered to be more modern) provedincorrect. Linux has been ported to all major platforms and its opendevelopment model has led to an exemplary pace of development. Incontrast, GNU Hurd has not yet reached the level of stability that would allowit to be used on a production server. His dismissal of the Intel line of 386processors as weird has also proven short-sighted, as the x86 series ofprocessors and the Intel Corporation would later become near ubiquitous inpersonal computers.
  9. 9. Torvalds announced in 1996 that there would be a mascot for Linux, apenguin. This was due the fact when they were about to select themascot, Torvalds did mention he was bitten by a Little Penguin(Eudyptula minor, J. R. Forster 1781) on a visit to the National Zoo &Aquarium, Canberra, Australia. Larry Ewing provided the original draftof todays well known mascot based on this description. The firstperson to call the penguin "Tux" was James Hughes, who said that itstood for "(T)orvalds (U)ni(X)". However, tux is also an abbreviation oftuxedo, the outfit which springs to mind when one sees a penguin.The name Tux was suggested by James Hughes as derivative ofTorvalds UniX.Official mascot:-TUX
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