自己编的一个通讯录系统（简陋了点）[2]

                                                        read name
                                                        checkperson
                                                        check
                                                        identify
                                                ;;
                                                q|Q )
                                                        menu
                                                ;;
                                                * )
                                                        echo  "Error! Please input y or n or q (quit to main menu )!"
                                                ;;
                                        esac
                                done
                        fi
        fi
}
 
function checkmail ()
{
        if [ -z $mail ]; then mail="user@localhost.localdomain"; fi
        mail_check=`echo $mail | sed -n '/\@*\./p'`
        if [ -z $mail_check ]
                then