
echo [accept|refuse]                              Default: accept

        Display or set the flag controlling client Telnet's response to a
        remote WILL ECHO offer.

        The Telnet presentation protocol specifies that in the absence of
        a negotiated agreement to the contrary, neither end echoes data
        received from the other.  In this mode, a Telnet client session
        echoes keyboard input locally and nothing is actually sent until
        a CR is typed.

        Local line editing is also performed: backspace deletes the last
        character typed, while control-U deletes the entire line.

        When communicating from keyboard to keyboard the standard local
        echo mode is used, so the setting of this parameter has no
        effect.  However, many timesharing systems (e.g. UNIX) prefer to
        do their own echoing of typed input. (This makes screen editors
        work right, among other things). Such systems send a Telnet WILL
        ECHO offer immediately upon receiving an incoming Telnet
        connection request.

        If 'echo accept' is in effect, a client Telnet session will
        automatically return a DO ECHO response.  In this mode, local
        echoing and editing is turned off and each key stroke is sent
        immediately (subject to the Nagle tinygram algorithm in TCP).

        While this mode is just fine across an Ethernet, it is clearly
        inefficient and painful across slow paths like packet radio
        channels.  Specifying 'echo refuse' causes an incoming WILL ECHO
        offer to be answered with a DONT ECHO; the client Telnet session
        remains in the local echo mode.  Sessions already in the remote
        echo mode are unaffected. (Note: Berkeley Unix has a bug in that
        it will still echo input even after the client has refused the
        WILL ECHO offer.  To get around this problem, enter the 'stty -
        echo' command to the shell once you have logged in).



