单项选择题
Which command will change the user webserver’s shell toksh93？（）
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 Which command will set the core size file to unlimited for the user‘webapp’？（）
单项选择题 Which environment variable must be changed in auser’s profile so that upon login，the command prompt identifies the server？（）
单项选择题 Which command should be used to reset a failed login count?（）
