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To: Michael Richardson <mcr@sandelman.ca>
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From: Johnathan Mantey <johnathanx.mantey@intel.com>
Subject: Re: ANSI Escape sequence unexpected output
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Date: Thu, 18 Feb 2021 11:52:00 -0800
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From: Johnathan Mantey <johnathanx.mantey@intel.com>
To: Michael Richardson <mcr@sandelman.ca>
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Message-ID: <f01d2a0f-7889-0cbf-30c2-6ea411668ea2@intel.com>
Subject: Re: ANSI Escape sequence unexpected output
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On 2/18/21 9:37 AM, Michael Richardson wrote:
> Johnathan Mantey <johnathanx.mantey@intel.com> wrote:
>      > David, I see a garbage sequence like this all the time.
>
>      > I run an Expect script that controls my terminal emulator (kermi=
t), and
>      > I see a sequence like this: [[39;88R I have tried multiple times=
 to
>
> That's the result of a Device-Status Report.
> https://en.wikipedia.org/wiki/ANSI_escape_code#CSIsection, see "DSR" or=
 "CSI 6n"
> 39 88 is the size of your terminal, or the one that Kermit is emulating=
 for you.
> (I seem to recall think that kermit has a full-screen mode. So many dif=
ferent
> versions of it over the decades)
> You may be able to turn kermit responding off, or change it's terminal =
type
> to dumb.
>
> The shell is emitting ESC [ 6n to set the stty size of the terminal.
> "resize" does this, but I think gnureadline does too.
Thanks for the information.

This motivated me to mess with this again.
FWIW, The DSR command is present when I run Kermit from within a TMux fra=
me.
This code, [[40;162R, is present when I run without TMux, and just use=20
Konsole.
Both sequences are emitted AFTER the password has been input, and accepte=
d.

Password:
Last login: Thu Feb 18 19:45:28 UTC 2021 on ttyS4
^[[39;81Rroot@intel-obmc

Using "set terminal type dumb" did not impact the emission of the ESC=20
sequence.
I haven't found the "turn responding off" control yet.

> --
> ]               Never tell me the odds!                 | ipv6 mesh net=
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> ]   Michael Richardson, Sandelman Software Works        |    IoT archit=
ect   [
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>
>

--=20
Johnathan Mantey
Senior Software Engineer
*azad te**chnology partners*
Contributing to Technology Innovation since 1992
Phone: (503) 712-6764
Email: johnathanx.mantey@intel.com <mailto:johnathanx.mantey@intel.com>



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