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Chapter 1 Introduction to System Programming

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UNIXLectureNotesChapter1IntroductiontoSy stemProgrammingStewartWeissChapter1Intro ductiontoSystemProgramming UNIXisbasicallyasimpleop eratingsystem,butyouhavetob eageniustounderstandthesimplicity. -DennisRitchie, ,Systemcal lsandlibraries,Processes,loginsandshel ls,Environments,manpages,Users,theroot,a ndgroups,Authentication,Filesystem, lehierarchy,Filesanddirectories,Devicesp ecial les,UNIXstandards,POSIX,Systemprogrammin g,TerminalsandANSIescapesequences,Histor yofUNIX,syscal l,getpid, ductionAmo dernsoftwareapplicationtypicallyneedstom anageb , les,screendisplays, ewrittenasacollectionofco op eratingthreadsorsub-pro cessesthatco ordinatetheiractionswithresp dernop eratingsystemspreventapplicationsoftware frommanagingsystemresourcesdirectly, ,whenrunningonmo dernop eratingsystems.

keyboard and display screen are part of the console device. Listings 1.1 and 1.2 contain examples of such a program, one using the C Standard I/O Library, and the other, the C++ stream library. Both get input from the keyboard and send output to the display device, which is some sort of a console window on a monitor.

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