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NOSVIEW
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ECHO
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1991-09-18
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==== NOSview [137]
echo
====
_________________________________________________________________
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).
>> Example: echo accept