单项选择题
A system administrator has been asked to lock a specific login account. Which of the following commands is used to accomplish this？（）
A.pwdck
B.usrck
C.chuser
D.rmuser
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Auserwouldliketheirshellprompttoreflectthecurrentdirectory.Whichofthefollowingenvironmentvariablescanbesettoaccomplishthis？（）
A.PS1
B.PATH
C.PROMPT
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单项选择题
WhichofthefollowingcommandscanbeusedtogetthesystemreadytophysicallyinsertaPCIhotplugadaptor？（）
A.mkdev
B.cfmgr
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单项选择题
WhichofthefollowingcommandscanbeusedtoidentifyallPCIhotplugslotsonaserverandtheircharacteristics？（）
A.lsattr -l pci
B.lscfg -Cc pci
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D.lsslot -c pci -a
