单项选择题
Which command will change the user webserver’s shell to ksh93?()
	A.chshell -ksh93 webserver
	B.chsh webserver /usr/bin/ksh93
	C.chuser -a shell=/usr/bin/ksh93 webserver
	D.setuid -a SHELL=/usr/bin/ksh93 -u webserver
                    
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Whichenvironmentvariablemustbechangedinauser’sprofilesothatuponlogin,thecommandpromptidentifiestheserver?()
A.PMT
B.PS1
C.PRT
D.PT1 - 
                                    单项选择题
                                    
Whichcommandwillsetthecoresizefiletounlimitedfortheuser‘webapp’?()
A.no -p ’core=-1’ webapp
B.chuser ’core=-1’ webapp
C.setsenv -attr ’core=unlimited’ webapp
D.chsec -f ’/etc/security/limits’ ’core=-1’ webapp - 
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Whichcommandshouldbeusedtoresetafailedlogincount?()
A.chsec
B.chusr
C.passwd
D.chgusrprf