Reading # 1 - UNIX OS Basics

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  What is UNIX? ã   UNIX is an Operating System (OS). ã   An operating system is a group of control programs that helps the user communicate with the computer hardware. ã   The most popular operating systems: Windows95/98/NT/2000, DOS ã   UNIX was developed by AT&T Bell Labs in the US (95% written in “C” programming language).    Most Important Features of UNIX ã   Most important feature of UNIX: Stability    more than 30 years to get the bugs out    Important in shared environments and critical applications ã   Shared Environments :    Windows98/NT crashes more as compare to UNIX servers ã   Critical Applications    Hospital    Airport    Real -Time Applications  Unix – Basics ã   UNIX is a multi user and multi tasking system.    Multi User means many users can use the same system at the same time.    Multi Tasking means you work on more than one job at the same time. ã   In UNIX, you can create your own commands and run them. ã   UNIX takes commands from standard input and interfaces with the hardware to execute those commands. ã   UNIX is case sensitive.  Unix – Basics ã   UNIX does not allow spaces in file names or commands. ã   UNIX is actually a group of programs that work together to perform various tasks. ã   In UNIX everything is a file. E.g. Printers are files, Directories are files etc. ã   UNIX has a hierarchical, universal file system.
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