A.head B.tail C.cat D.more
A.chown hlr:staff Sroute B.chusr hlr:staff Sroute C.chown hlr staff Sroute D.chusr hlr staff Sroute
A.用戶為sa,口令為Pserver1234 B.用戶為sa,口令為server1234 C.用戶為Usa,口令為Pserver1234 D.用戶為Usa,口令為server1234