CLICKHERETO DOWNLOAD
FileSystemcommands,IOcommands,IOredirectionExercisesThisbooklooksatUnix(andLinux)shellprogrammingandsystemadministrationPredicates, operatorsfortestingstrings,intsandfiles.CommandLineArguments.If-then-elseinShell.EvaluatingExprinShell.Itsfeaturesincludecontrol-flowprimitives, parameterpassing,vari%PDF%âãÏÓobj>endobjobj>endobjobj>streamx¬»ctem6Û¶mWR±“ŠmgǶmWlÛvŶ“ŠmÛùò¼Gݧ{ôÓçß}O\ÓsŒµ×ÚäÄòJô ThePowerofShellUNIXBasicsShellFundamentalsShellCommandsShellisionsandRepetitionsShellProgrammingPtShellProgrammingUserscommunicatewith thekernelthroughaprogramknownastheshellShellvariablesTwo-waycommunicationispossiblebetweentheshellandcommandsTheUNIXshell EvaluatingExprinShellMasteringUnixshellscripting:Bash,Bourne,andKornShellscriptingforprogrammers,systemadministrators,andUnixgurus:Michael, RandalK:FreeDownload,Borrow,/INTRODUCTIONSimpleShellScriptsAsacom-mandinterpreter,theshellprovidestheuserinterfacetotherichsetof gnuutilities.AshellscriptisatextfilethatcontainsasequenceofcommandsforaUNIX-basedoperatingsystem.Shellvariables.FileSystemcommands,IO commands,IOredirection.Itsfeaturesincludecontrol-flowprimitives,parameterpassing,vari-ablesandstringsubstitution.Mostoftheprinciplesthisbookcovers applyequallywelltoscriptingwithothershells,suchastheKornShell,fromwhichBashderivessomeofitsfeatures,[4]andtheCShellanditsvariants CommandLineArgumentsTheshellisacommandlineinterpreter;ittranslatescommandsenteredbytheuserandconvertsAUnixshellisbothacommand interpreterandaprogramminglanguageSimpleShellScriptsFilescontainingcom-mandscanbecreated,andbecomecommandsthemselvesItiscalledascript becauseitcombinesasequenceofcommands-thatwouldotherwisehavetobetypedintoakeyboardoneatatime-intoasinglescriptAshellscriptisatextfile thatcontainsasequenceofcommandsforaUNIX-basedoperatingsystemItiscalledascriptbecauseitcombinesasequenceofTheUNIXshell(NotethatC ShellprogrammingAdvancedBash-ScriptingGuideThisiswhereshellscriptingcomesin.ThesenewcommandshavetheBashhasbecomeadefactostandard forshellscriptingonmostflavorsofUNIXAshellscriptisatextfilethatcontainsasequenceofcommandsforaUnix-basedoperatingsystemWritingShell scriptsItiscalledascriptbecauseitcombinesasequenceofcommands thatwouldotherwisehavetobetypedintoakeyboardoneatatime intoasingle scriptTheshellisacommandprogramminglanguagethatprovidesaninterfacetotheUNIX†operatingsystemTheUnixshellisanattractivechoiceforspecifying succinctbutpowerfulscriptsforsystemorchestration,dataprocess-ing,andTheshellisacommandprogramminglanguagethatprovidesaninterfacetothe UNIX†operatingsystemTheprogramminglanguagefeaturesallowtheseutilitiestobecombinedThefor,whileanddoloopinShellThisbookcoversthebasic materialsneededforyoutounderstandhowtoadministeryourownLinuxorUnixserver,aswellashowtorunyourownpersonaldesktopversionofLinuxor MacOSXConstructssuchaswhile,ifthenelse,caseandforareavail-able.