send "Ctrl ]" to the remote system

[SebMuller]

Hi,

I am using the telnet module (Telnet.pm) in order to automate some
unix-sessions.
It works so far great, but during the telnet session I would like to
send the escape character ("Ctrl ]") to the remote system.
How shall I encode "Ctrl ]"?

Thanks, Sebastian

[Brian McCauley]

[email]sebastian.mueller@etsi.org[/email] (SebMuller) writes:

> I am using the telnet module (Telnet.pm) in order to automate some
> unix-sessions.
> It works so far great, but during the telnet session I would like to
> send the escape character ("Ctrl ]") to the remote system.
> How shall I encode "Ctrl ]"?

There is no need to encode it in any special way.

I suspect you are confused. The Ctrl-] character is not special in
the telnet connection.

The Ctrl-] character is special in the stream between a controlling
terminal and the Unix telent program. But you are not using the Unix
telnet program.

--
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[SebMuller]

Brian McCauley <nobull@mail.com> wrote in message news:<u97k50gypi.fsf@wcl-l.bham.ac.uk>...

> [email]sebastian.mueller@etsi.org[/email] (SebMuller) writes:
>

> > I am using the telnet module (Telnet.pm) in order to automate some
> > unix-sessions.
> > It works so far great, but during the telnet session I would like to
> > send the escape character ("Ctrl ]") to the remote system.
> > How shall I encode "Ctrl ]"?

>
> There is no need to encode it in any special way.
>
> I suspect you are confused. The Ctrl-] character is not special in
> the telnet connection.
>
> The Ctrl-] character is special in the stream between a controlling
> terminal and the Unix telent program. But you are not using the Unix
> telnet program.

You are absolutely right. Actually the question is: What has to be
send to make the remote system (Unix) execute the command Ctrl-A or
Ctrl-C etc.
Because $t->cmd("Ctrl-A") won't do it (see below).
Perhaps ASCII code?
----------------------------------------------------------------
use Net::Telnet();
$t = new Net::Telnet (-timeout => 10, -prompt => '/$prompt $/');
....
@lines = $t->cmd("Ctrl-A");
----------------------------------------------------------------

[SebMuller]

Brian McCauley <nobull@mail.com> wrote in message news:<u9u182dlyq.fsf@wcl-l.bham.ac.uk>...

> [email]sebastian.mueller@etsi.org[/email] (SebMuller) writes:
>

> > Brian McCauley <nobull@mail.com> wrote in message news:<u97k50gypi.fsf@wcl-l.bham.ac.uk>...

> > > [email]sebastian.mueller@etsi.org[/email] (SebMuller) writes:
> > >
> > > > I am using the telnet module (Telnet.pm) in order to automate some
> > > > unix-sessions.
> > > > It works so far great, but during the telnet session I would like to
> > > > send the escape character ("Ctrl ]") to the remote system.
> > > > How shall I encode "Ctrl ]"?
> > >
> > > There is no need to encode it in any special way.
> > >
> > > I suspect you are confused. The Ctrl-] character is not special in
> > > the telnet connection.
> > >
> > > The Ctrl-] character is special in the stream between a controlling
> > > terminal and the Unix telent program. But you are not using the Unix
> > > telnet program.

> >
> > You are absolutely right. Actually the question is: What has to be
> > send to make the remote system (Unix) execute the command Ctrl-A or
> > Ctrl-C etc.
> > Because $t->cmd("Ctrl-A") won't do it (see below).
> > Perhaps ASCII code?

>
> You now appear to be asking how to encode non-printable characters in
> Perl string literals. This is explained in perlop/"Quote and
> Quote-like Operators". (I will not criticise you for not finding that
> yourself, thinking of a string literal as an operator is not intuative
> to all!)
>
> Note that Ctrl-C may, depending on context, be different. You may not
> actually want to sent the ASCII Ctrl-C in-band but rather the Telnet
> "interrupt process" command.

I found the following solution for sending Ctrl-A to the remote
system:
## SEND CTRL+A
$var_0=chr(1);
@lines=$t->print($var_0);

Unfortunately the above does not work for Ctrl-]. I needed Ctrl-] only
to exit the telnet session correctly. Instead of Ctrl-] is use
therefore directly "exit".

[Brian McCauley]

[email]sebastian.mueller@etsi.org[/email] (SebMuller) writes:

> Brian McCauley <nobull@mail.com> wrote in message news:<u9u182dlyq.fsf@wcl-l.bham.ac.uk>...

> > [email]sebastian.mueller@etsi.org[/email] (SebMuller) writes:
> >

> > > Brian McCauley <nobull@mail.com> wrote in message news:<u97k50gypi.fsf@wcl-l.bham.ac.uk>...
> > > > [email]sebastian.mueller@etsi.org[/email] (SebMuller) writes:
> > > >
> > > > > I am using the telnet module (Telnet.pm)..

> > > > > How shall I encode "Ctrl ]"?
> > > >
> > > > There is no need to encode it in any special way.
> > > >
> > > > I suspect you are confused. The Ctrl-] character is not special in
> > > > the telnet connection.
> > > >
> > > > The Ctrl-] character is special in the stream between a controlling
> > > > terminal and the Unix telent program. But you are not using the Unix
> > > > telnet program.
> > >
> > > You are absolutely right. Actually the question is: What has to be
> > > send to make the remote system (Unix) execute the command Ctrl-A or
> > > Because $t->cmd("Ctrl-A") won't do it (see below).

> >
> > You now appear to be asking how to encode non-printable characters in
> > Perl string literals. This is explained in perlop/"Quote and
> > Quote-like Operators".

>
> I found the following solution for sending Ctrl-A to the remote
> system:
> ## SEND CTRL+A
> $var_0=chr(1);
> @lines=$t->print($var_0);

That is not as neat as the methods explained in is the manual
page to which I directed you.

> Unfortunately the above does not work for Ctrl-]. I needed Ctrl-] only
> to exit the telnet session correctly.

Of course it doesn't I exaplain why above where I said "I suspect to
are confused". You have now confirmed my suspicion.

--
\\ ( )
. _\\__[oo
.__/ \\ /\@
. l___\\
# ll l\\
###LL LL\\