单项选择题
Which command will display the current control key settings?()
	A.‘tty -l’
	B.‘stty -a’
	C.‘lstty -a’
	D.‘terminfo -l’
                    
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Whichcommandwillchangetheuserwebserver’sshelltoksh93?()
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 - 
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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