单项选择题
A system administrator would like to verify the user definitions in the /etc/passwd file. Which of the following commands will accomplish this？（）
A.usrck
B.sysck
C.lssec
D.lsuser
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单项选择题
Asystemadministratorhasbeenaskedtolockaspecificloginaccount.Whichofthefollowingcommandsisusedtoaccomplishthis？（）
A.pwdck
B.usrck
C.chuser
D.rmuser -
单项选择题
Auserwouldliketheirshellprompttoreflectthecurrentdirectory.Whichofthefollowingenvironmentvariablescanbesettoaccomplishthis？（）
A.PS1
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WhichofthefollowingcommandscanbeusedtogetthesystemreadytophysicallyinsertaPCIhotplugadaptor？（）
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