A system’s backups are failing. Error log analysis indicates that there is either a hardware or media problem. Which command is used to determine if there is a hardware problem with the tape drive？（）

单项选择题Asystemadministratorwouldliketoverifytheuserdefinitionsinthe etc passwdfile.Whichofthefollowingcommandswillaccomplishthis？（）

A.usrck
B.sysck
C.lssec
D.lsuser

单项选择题Asystemadministratorhasbeenaskedtolockaspecificloginaccount.Whichofthefollowingcommandsisusedtoaccomplishthis？（）

A.pwdck
B.usrck
C.chuser
D.rmuser

单项选择题Auserwouldliketheirshellprompttoreflectthecurrentdirectory.Whichofthefollowingenvironmentvariablescanbesettoaccomplishthis？（）

A.PS1
B.PATH
C.PROMPT
D.LOCPATH

单项选择题WhichofthefollowingcommandscanbeusedtogetthesystemreadytophysicallyinsertaPCIhotplugadaptor？（）

A.mkdev
B.cfmgr
C.drslot
D.lsslot

单项选择题WhichofthefollowingcommandscanbeusedtoidentifyallPCIhotplugslotsonaserverandtheircharacteristics？（）

A.lsattr -l pci
B.lscfg -Cc pci
C.lsconn -p pci -a
D.lsslot -c pci -a