单项选择题
How should read, write and execute permissions for ‘group’ and ‘other’ be granted to all files and directories within the /app filesystem?()
	A.chmod -R 677 /app
	B.chmod -R 664 /app
	C.chmod -r 677 /app
	D.chmod -r 664 /app
                    
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                                    单项选择题
                                    
Whichcommandwilldisplaythecurrentcontrolkeysettings?()
A.‘tty -l’
B.‘stty -a’
C.‘lstty -a’
D.‘terminfo -l’ - 
                                    单项选择题
                                    
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 - 
                                    单项选择题
                                    
Whichenvironmentvariablemustbechangedinauser’sprofilesothatuponlogin,thecommandpromptidentifiestheserver?()
A.PMT
B.PS1
C.PRT
D.PT1