linux安全检测及防护-单选题（linux security detection and protection）

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1、linux安全检测及防护-单选题（Linuxsecuritydetectionandprotection）===<<>>===1.thecorrectdescriptionofthestandardinputandoutputis[()[selectionof1items]ThefilenumberofA.stdinis0,andthedefaultdeviceisthekeyboardThefilenumberofB.stdinis1,andthedefaultdeviceistheke

2、yboardThefilenumberofC.stderris1,andthedefaultdeviceisthemonitorThefilenumberofD.stdoutis2,andthedefaultdeviceisthemonitor2.aboutsinglequotationmarksanddoublequotationmarks,thecorrectdescriptionis()[select1items]A.singlequotescanrefertothevalueofavariableB.doubleq

3、uotescan'trefertovariablevaluesinsideThereisnodifferencebetweenC.singlequotesanddoublequotes,andtheeffectisthesameintheprocessofvariablereferenceD.doublequotescanrefertothevalueofavariable3.thefunctionofthereversequotationis[()[select1items]A.isinquotationmarkstor

4、efertothevalueofavariableB.isinreversequotetodefinevariablesforspecialcharactersC.isinreversequotationmarkstochangetheresultofacommandtothevalueofavariableD.isinquotationmarkstorefertovariablesunderthesubshellThefunctionof4.braces{}is[()][1items]A.todistinguishthe

5、valuesofthelocalvariablesandtheenvironmentvariables,B.isusedtodistinguishthevariablevaluesfromtheordinarycharactersC.__inordertorefertotheresultofaspecialcommandasavariablevalueD.,inordertochangethelocalvariableintotheenvironmentvariable5.useBashand.Whenyouexecute

6、scripts,thedifferencebetweenthetwowaysis()[choosing1items]ThereisnodifferencebetweenA.andthescriptfilecanbeexecutedlaterB.bashwillexecutethefollowingscriptfileinthecurrentshellenvironmentC..ThescriptfilewillbeexecutedinthecurrentshellenvironmentD.usesbashtoexecute

7、scriptsthatrequirepermissiontosetXforscriptfiles6.whichfilerecordsthetypeofShellsupportedbythecurrentsystem(select1items)A./etc/shellsB./var/shellsC./usr/shellsD./boot/shells7.,thecharactersinthepass.txtfileastheuserTerrypassword,thenthefollowingcorrectoperationis

8、()[select1items]A.passwd--stdinTerry>pass.txtB.passwd--stdinTerry

9、Thereare20linesofdat