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1、ProgramminginCshellThroughtheDemoandTraiCentre,Orbotechiscommittedtoofferingitscustomersthehighestqualityprofessionaltraining,whichprovidesthemostefficientandeconomicalsolutionstothechallengesofthePrintedCircuitBoardIndustry.SouthernChinaCommittedtoExcellence4B-4C,BlockC1ElectronicsScience&Technolog
2、yBldg.No.2070ShennanZhongRoadShenzhen518031Tel:(86)7553287800Fax:(86)7553287801DemozTrainingCentreSouthernChinaOrtxitechTechnology(Shenzhen)CompanyLtd.No.107-113,Block5A,InternationalCommerceCenterNo.1001HonghuaRoad,FutianFreeTradeZoneGuangzhouOfficeRoom1006-7l10F,EastTowerTianheEntertainmentPlaza62
3、1TianheRoadGuangzhou510630Tel:(86)20-8757-4616Fax:(86)20-8757-4620Tel:(86)75535951303595137NorthernChinaCommittedtoExcellenceFax:(86)7553595135DemoZTrainingCentreNorthernChinaShanghaiOffice1F,278ZhuJiangRoad(N)KunshanDevelopmentZoneKunshan1F,278ZhuJiangRoad(N)KunshanDevelopmentZoneKunshanRoom243,Xin
4、MaoBuilding,2TaiZhongRoad(三)WaigaoqiaoFreeTradeZone,Shanghai200131Tel:(86)520-735-7745Fax:(86)520-735-8628Tel:(86)520-735-7745Fax:(86)520-735-8628Tel:(86)21-5048-0555*4202Fax:(86)21-5048-0555-4202Cshismorethanasimplecommandlineprocessor.Itisalsoaprogramminglanguage.Youcanwriteprograms(calledscripts)
5、thatareexecutedbytheCShell.CONTENTSLCOmmandform琏音误!未定义书签。SingIeCOmmandlMUltiPleCommandS2COmmandGrOUPS3ConditionalCommandExecution4SUrnmary52IOredirectionandPiDeS音误!未定义书签。OUtPUtRedireCtionlAPPendingC)UtPUt2RedireCtingErrorC)UtPUl3SePanltingStandardOUtPUtandErrOrOUtPUt4TheBUilt-inNoClObberVariable5Red
6、ireCtingInPUt6COrmeCtingCommands:PiPeS7RedirectingStandardErrorThroughPipes9SummarylO3fWenameexpansion错误!未定义书签。FiIeIameEXPanSiOnMetaCharaCterSlMatChingFiIenameStringCOmPonentS2MatChingWithCharaCterSCIaSSeS3DeDVrdFilenameS4EscapeMechanisms5Summary641variableslSettingVaVabIeSlUsingShellVariables2Wordl
7、istVariables3VaVableSUbStitUtiOn4ReIeaSiagVariabIeS5TeStingifVariablesaseSet6PalhnamCVariableS7COmmandSUbStitUliOn8QUotiOgVariableS9ShellPreDefinedVariableslOSummaryl15,scriptslShellScriptslShelISCriCtS-EXamDleS2TheFOrmatOfShenSCriDtS3COmmentSinSheIISCriCtS4TheEChoCOmmand5ReadingDatafromtheTelTnina1
8、6PassingParameterstoShellProcedures7UsingArgv8TheShiflCommandloTheConditionalSlatemenl11ACaUIiOnOnUndefInedVariabIeS14TheEXECommand155.13SUmmary166.ExpreSSiolIEVaIUatk)IllEXDreSSiOnevaluationArithmetiCC)PeratorS2ReIatiOnalOPeratOrS3LOgiCalODeraIorS4OPeratOrPreCedenCe5FileInquiryOperators7SUmmary97Lu
9、odsandSWitCheSlTheForeaChStatementlTheWhveStatement2TheSWitChStatement3TheBreak&ContinUeStatement6theGotoStatement7SUmmary81. COMMANDFORMS11SlNGLECOMMANDTHEFoRNTATFoRASlNGLECOMMAND%command_nameargumentsNoTES1. command_nameisasimplenameoranyvalidpathname.2. argumentsmaybeaflag,apathnameorsomeotherspe
10、cialstring.3. Spacesand/ortabsalwaysseparatearguments.4. Akeystroketerminateseachcommandline.5. Youcanusetocontinuealongcommandtothenextline.EXAMPLESToprintthefullpathnameofyourcurrentworkingdirectory:%pwdTotypethestringHelloonourterminal:%echoHelloTocreatetwonewdirectoriesinyourcurrentdirectory:%mk
11、dirdir_ldir_2Tosearchthedirectoryhierarchystartingfromyourcurrentdirectoryforallthefilesnamedtest.dat,andtoprinttheirfullpathname:%find-nametest.dat-printNOTESIfyouliketogiveanargumentthathasablankinityoumustusequotesordoublequotes.EXAMPLES% prog New York % prog New Yorku % prog New Yorkoneargument=
12、NewYorkoneargument=NewYorktwoarguments;First=New,Second=York1.2MULTIPLECOMMANDSTheCShellallowsustoconcatenateseveralcommandsonasingleinputline.Asemicolonisusedtoseparatetheindividualcommands.THEFoRMATFoRMULTIPLECOMMANDS%command；command_2;command_nEXAMPLESTomakeanewdirectoryandtomakethatdirectorythew
13、ork_directory:%mkdirinformation;cdinformationGotoadirectoryandcompileaprogram,afterthatgototheroot:%cdsource;ccprogl.c;cd/NoTES TheC_Shellexecutescommand_1,Command_2,command_nsequentially. Eachcommandinthelistmayhavearguments. Usemultiplecommandswhenasetofcommandsformsalogicalgroup.1.3 COMMANDGROUPS
14、TheCShellallowsustotreatagroupofcommandsasasinglecommandandtorunthecommandgroupinasub_shell,preservingtheparentshellsenvironment.THEFORMATFoRACOMMANDGROUP%(cmd_l;cmd_2;.;cmd_n)EXAMPLESToillustrateacommandgroupinaction,consider:%(cdc_progs;ccprogl.c)Thiscommand(1)changesdirectories;(2)runsacompile;an
15、dthen(3)automaticallyreturnstoourparentshellandouroriginaldirectory.1.4 CONDITIONALCOMMANDEXECUTIONManyUNIXcommandsreturnstatusinformation.THECONVENTIONONormal(successful)exit.non-OAcommanderroroccurred.EXAMPLESTochecktheerrorstatusofacommand,usetheCShellvariablestatus:%echo$status1Inthiscase,Sstatus=1meansthatthefileprogl.cdoesntmatchthepatterngarfield.NoTES ACShellvariableisreferencedbyprefixingadollarsign(
