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Chapter 1 Introduction to System Programming

UNIXL ectureNotesChapter1 IntroductiontoSystemProgrammingStewartWe issChapter1 Intro ductiontoSystemProgramming unix isbasicallyasimpleop eratingsystem,butyouhavetob eageniustounderstandthesimplicity. -DennisRitchie, ,Systemcal lsandlibraries,Processes,loginsandshel ls,Environments,manpages,Users,theroot,a ndgroups,Authentication,Filesystem, lehierarchy,Filesanddirectories,Devicesp ecial les, unix standards,POSIX,Systemprogramming,Termin alsandANSI escapesequences,HistoryofUNIX,syscal l,getpid, ductionAmo dernsoftwareapplicationtypicallyneedstom anageb , les,screendisplays, ewrittenasacollectionofco op eratingthreadsorsub-pro cessesthatco ordinatetheiractionswithresp dernop eratingsystemspreventapplicationsoftware frommanagingsystemresourcesdirectly, ,whenrunningonmo dernop eratingsystems,applicationscannotdrawtot hescreendirectlyorreadorwrite erformscreenop erationsor leI/Otheymustusetheinterfacethattheop eratingsystemde ()orfprintf()access lesdirectly,theydonot.

material can be skipped by the experienced UNIX users. In the remainder of these notes, a distinction will be made between the user's view of UNIX and the prgroammer's view of UNIX. The user's view of UNIX is limited to a subset of commands that can be entered at the command-line and parts of the le system. Some commands and les are not

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