A.usermod-luser1user2 B.usermod-luser2user1 C.usermod-uuser1user2 D.usermod-uuser2user1
A.單用戶、單任務(wù) B.單用戶、多任務(wù) C.多用戶、單任務(wù) D.多用戶、多任務(wù)
A.:r/etc/passwd B.:i/etc/passwd C.:w/etc/passwd D.:s/etc/passwd