单项选择题
Which command will set the core size file to unlimited for the user‘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
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?（）
单项选择题 Which daemon identifies available filesystems throughthe /etc/xtab file?（）
