Key mappings in ssh

Key mappings in ssh

[rudy]

I have a problem using sshd on cygwin: the backspace key does not work as
expected, for example in vi (inserts ^? ) and cat. To get it working I
have to press Ctrl+H. Bash prompt behaves properly (therefore I assume
that readline interprets the keycode better). Also, local bash prompt (not 
using sshd, just starting ...\bin\bash.exe works ok (even with 
.bash_profile setting TERM to linux)

Environment: 
- latest (updated) complete cygwin version installation, 
- ssh client Putty (also ShellGuard -- former TelNeat), 
- TERM=linux (for shellguard) or xterm (for Putty)

There are some ways to get it working properly:
- using putty, I can configure backspace to send Ctrl+H
- if I open ShellGuard to a linux machine (where BackSpace works ok) then 
ssh to cygwin machine, it works again.

I am not very sure, but I *think* this occured recently, after (for 
example) updating cygwin's openssh, terminfo etc to latest versions.

I tried playing with bs option in shellguard's termcap.ini but no success.

Ideas?


Thanks in advance,
rudy


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Re: Key mappings in ssh

[David T-G]

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Rudy --

...and then rudy@viper.iasi.rdsnet.ro said...
% 
% I have a problem using sshd on cygwin: the backspace key does not work as
% expected, for example in vi (inserts ^? ) and cat. To get it working I

Is this ssh-ing out of your cygwin box or into it?

In either case, the problem is a tty configuration mismatch between where
you are (ssh nnnnn) and where you're going (running the shell).

Use

  stty -a

to see how your current settings are (look particularly for "erase") and
then

  stty erase NN

to set it as you wish (say ^ and ? or perhaps ^ and h).

If you always send delete, then you can just put

  stty erase ^?

into your .profile (or .bash_profile or .bashrc or whatever it is if
you're coming back into your cygwin box; I haven't figured it out under
cygwin yet) and that will force the matter.

Another thing that folks sometimes do is whip up a simple script actually
named ctrl-h or ctrl-questionmark and put the relevant stty commands
in there; when you hit the backspace key at the prompt, you'll either
properly try to back up and do nothing or spit out a wonky character,
which the shell will interpret when you hit return and away you go :-)
I don't recommend it (these things should really be negotiated better,
and your term settings should be transparent) but it's a useful kludge.


...
% Ideas?

HTH & HAND


% 
% 
% Thanks in advance,
% rudy


:-D
-- 
David T-G                      * It's easier to fight for one's principles
(play) davidtg@justpickone.org * than to live up to them. -- fortune cookie
(work) davidtgwork@justpickone.org
http://www.justpickone.org/davidtg/    Shpx gur Pbzzhavpngvbaf Qrprapl Npg!


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Thanks (Re: Key mappings in ssh) & OE allergic to PGP?

[Max Bowsher]

Many thanks, David, for that stty hint - that solves a problem I have lived with
for quite a while - I haven't found any good introductions to the finer points
of terminals on the web.

Secondly, I'm beginninge to suspect that Outlook Express is allergic to PGP
signed mail. (It displays a blank mail, with the body in a .txt attachment and
the PGP sig in a .dat attachment.) I know that the obvious answer is to get a
better mail client, but does anyone have any workarounds in the mean time?

Max.


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Re: Thanks (Re: Key mappings in ssh) & OE allergic to PGP?

[David T-G]

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Hash: SHA1

Max --

...and then Max Bowsher said...
% 
% Many thanks, David, for that stty hint - that solves a problem I have lived with

Happy to help!


% for quite a while - I haven't found any good introductions to the finer points
% of terminals on the web.

*grin*


% 
% Secondly, I'm beginninge to suspect that Outlook Express is allergic to PGP
% signed mail. (It displays a blank mail, with the body in a .txt attachment and

<dryly>amongst other things</dryly>


% the PGP sig in a .dat attachment.) I know that the obvious answer is to get a
% better mail client, but does anyone have any workarounds in the mean time?

If you ask *really* nicely I can fold and mutilate my mail enough to
work for you, like I have this one, but you have, indeed, correctly hit
upon the obvious answer.  To keep this on topic, I suggest mutt under
cygwin :-)


% 
% Max.


HTH & HAND

:-D
- -- 
David T-G                      * It's easier to fight for one's principles
(play) davidtg@justpickone.org * than to live up to them. -- fortune cookie
(work) davidtgwork@justpickone.org
http://www.justpickone.org/davidtg/    Shpx gur Pbzzhavpngvbaf Qrprapl Npg!

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bvq3ux9RNriIcdyqU1Ekgjw=
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RE: Key mappings in ssh

[Tony Arnold]

Rudy,

> Thanks for the tip with stty. It worked ok. Now I'm facing 
> the following 
> problem:
> -I need to have stty erase ^? while connecting with ssh to 
> cygwin -and on the other hand I need stty erase ^H in bash prompts

I think bash should work with erase set to either ^? Or ^H. Try it!

Regards,
Tony.
-- 
Tony Arnold, Deputy to the Head of COS Division, Manchester Computing,
University of Manchester, Oxford Road, Manchester M13 9PL.
T: +44 (0)161 275 6093, F: +44 (0)870 136 1004, M: +44 (0)773 330 0039
E-mail: tony.arnold@man.ac.uk, Home: http://www.man.ac.uk/Tony.Arnold


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Re: Key mappings in ssh

[rudy]

> Is this ssh-ing out of your cygwin box or into it?

I am using a third party client to connect to sshd on cygwin.

Thanks for the tip with stty. It worked ok. Now I'm facing the following 
problem:
-I need to have stty erase ^? while connecting with ssh to cygwin
-and on the other hand I need stty erase ^H in bash prompts

So I try writing a script (which can't rely on /var/run/utmp, as cygwin 
doesn't seem to maintain it) to tell which stty param to run... 

ps reports processes using either con either 0 1 2 ... tty's, so I should 
be able to detect this. I still don't know how but... :-)

Another question: linux man page for termcap tells that kb is a string 
parameter. Indeed, on linux systems (and not only) in /etc/termcap we can 
find, for example ...:kb=\177:... Why does the cygwin termcap only 
specifies ...:kb:... ?

Thanks again,
rudy

PS btw: I ran stty -a both on bash prompt and ssh prompt. Why do they 
report differently? Does the ssh protocol negociates this kind of settings 
on startup?


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