MBA
Linux Unit i & ii.pdf

Linux Unit i & ii.pdf - UNIT I Development of UNIX...

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UNIT I
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Development of UNIX system began in 1957 In 1957 BELL labs required an OS for their in house Computer Centre They Developed BESYS to control their computing Jobs In 1964 BELL Labs, MIT and General Electric came together and created a system called MULTICS. IN 1969 the MULTICS project was withdrawn due to its high cost of development and differences between GE , BELL Labs.
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UNIX was developed in 1969 at AT & T Bell Labs by Ken Thompson & Dennis Ritchie for PDP-7 machine. PDP stands for Programmed Data Processor Unix is an acronym for Uniplexed Information computing system’ (UNICS) as ICS sounds as IX, it got its name as UNIX In 1973 UNIX was rewritten in ‘C’ making it highly portable and was ported to PDP-11/20 system. In 1971 the first version of UNIX came out which supported around 60 commands but without the pipe feature Third Version came out in 1973 which supported the PIPE feature and C compiler was made an intrinsic part of the OS.
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Unix is more flexible and can be installed on many different types of machines, including main-frame computers, supercomputers and micro-computers. Unix is more stable and does not go down as often as Windows does, therefore requires less administration and maintenance. Unix has greater built-in security and permissions features than Windows. - Unix possesses much greater processing power than Windows .
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Low cost: You don’t need to spend time and money to obtain licenses since Linux and much of its software come with the GNU General Public License. You can start to work immediately without worrying that your software may stop working anytime because the free trial version expires. Additionally, there are large repositories from which you can freely download high quality software for almost any task you can think of. Stability: Linux doesn’t need to be rebooted periodically to maintain performance levels. It doesn’t freeze up or slow down over time due to memory leaks and such. Continuous up-times of hundreds of days (up to a year or more) are not uncommon. Performance: Linux provides persistent high performance on workstations and on networks. It can handle unusually large numbers of users simultaneously, and can make old computers sufficiently responsive to be useful again. Network friendliness: Linux was developed by a group of programmers over the Internet and has therefore strong support for network functionality; client and server systems can be easily set up on any computer running Linux. It can perform tasks such as network backups faster and more reliably than alternative systems. Flexibility: Linux can be used for high performance server applications, desktop applications, and embedded systems. You can save disk space by only installing the components needed for a particular use. You can restrict the use of specific computers by installing for example only selected office applications instead of the whole suite.
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  • Spring '10
  • Armour

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