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I Introduction The primary part of every computer is its operating system It is first loaded into memory at boot-up and performs many essential functions such as providing an interface for the hardware and other software Many operating systems have been developed over the years UNIX is outstanding in both its long life and strength II UNIX - In the Beginning UNIX was first formulated in the Bell Laboratories under ATT Its development is primarily associated with Ken Thompson and Dennis Ritchie The reason behind its development was remarkably enough because Ken Thompson had developed a game called Space Travel for a mainframe OS Mainframe time was expensive They decided to transform the game to run on a smaller computer But a new operating system was needed and voila - UNIX The UNIX project team members established a set of guidelines to assist them in development of the system i Make each program do one thing well To do a new job build afresh rather than complicate old programs by adding new features ii Expect the output of every program to become the input to another as yet unknown program Dont clutter output with extraneous information Avoid stringently columnar or binary input formats Dont insist on interactive input iii Design and build software even operating systems to be tried early ideally within weeks Dont hesitate to throw away the clumsy parts and rebuild them iv Use tools in preference to unskilled help to lighten a programming task even if you have to detour to build the tools and expect to throw some of them out after youve finished using them The first documentation of the new operating system was the UNIX Programmers Manual by Ken Thompson and Dennis Ritchie In the second edition of the manual it was mentioned that the number of Unix installations has grown to 10 In 1973
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