A system administrator would like to verify the user definitions in the /etc/passwd file. Which of the following commands will accomplish this？（）

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