The most famous suppressed book in computer history Used as an Operating System textbook at MITAfter 20 years this is still the best expostion of the workings of a real operating system. Ken Thompson Developer of the UNIX operating systemAfter years of suppression as trade secrets by various owners of the UNIX code this tome has been rereleased and we owe a debt to all involved in making this happen. I consider this to be the single most important book of 1996. Unix Review June 1997The Lions book cherished by UNIX hackers and widely circulated as a photocopied bootleg document since the late 1970s is again available in an unrestricted edition. This legendary underground classic reproduced without modification is really two works in one the complete source code to an early version Edition 6 of the UNIX operating system a treasure in itself a brilliant commentary on that code by John Lionswith additional historical perspective essays added in 1996.Lions marriage of source code with commentary was originally used as an operating systems textbook a purpose for which it remains superbly wellsuited as evidenced by its ongoing use at MIT.