GNU bug report logs - #5334
23.1.91; Term mode prints "0;user@host:~" before each prompt of an interactive SSH session

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Scott Bell <sctb <at> me.com>
To: emacs-pretest-bug <at> gnu.org
Subject: 23.1.91; Term mode prints "0;user <at> host:~" before each prompt of an
	interactive SSH session
Date: Thu, 07 Jan 2010 12:07:57 -0700

Under GNU Emacs 23.1.91.1 (x86_64-apple-darwin10.2.0, 
NS apple-appkit-1038.25), Mac OS X 10.6.2, Term mode
prints the following prompt during an interactive SSH
session ('ssh host'):

0;user <at> host:~(host:~)$ 

when PS1 is set to '(\h:\W)\$ ' on the remote host. 

The string '0;user <at> host:~' is not displayed when using
another terminal emulator.	

Message #8 received at 5334 <at> debbugs.gnu.org (full text, mbox):

From: Dan Nicolaescu <dann <at> ics.uci.edu>
To: Scott Bell <sctb <at> me.com>
Cc: 5334 <at> debbugs.gnu.org
Subject: Re: bug#5334: 23.1.91; Term mode prints "0;
	user <at> host:~" before each prompt of an interactive SSH session
Date: Thu, 7 Jan 2010 13:37:30 -0800 (PST)

Scott Bell <sctb <at> me.com> writes:

  > Under GNU Emacs 23.1.91.1 (x86_64-apple-darwin10.2.0, 
  > NS apple-appkit-1038.25), Mac OS X 10.6.2, Term mode
  > prints the following prompt during an interactive SSH
  > session ('ssh host'):
  > 
  > 0;user <at> host:~(host:~)$ 
  > 
  > when PS1 is set to '(\h:\W)\$ ' on the remote host. 
  > 
  > The string '0;user <at> host:~' is not displayed when using
  > another terminal emulator.	

You probably set  PROMPT_COMMAND to something that term.el does not
understand.

Message #11 received at 5334 <at> debbugs.gnu.org (full text, mbox):

From: Scott Bell <sctb <at> me.com>
To: 5334 <at> debbugs.gnu.org
Subject: Re: bug#5334: 23.1.91; Term mode prints "0; user <at> host:~" before each
	prompt of an interactive SSH session
Date: Fri, 08 Jan 2010 10:03:50 -0700

On 2010-01-07, at 2:37 PM, Dan Nicolaescu wrote:

> Scott Bell <sctb <at> me.com> writes:
> 
>> Under GNU Emacs 23.1.91.1 (x86_64-apple-darwin10.2.0, 
>> NS apple-appkit-1038.25), Mac OS X 10.6.2, Term mode
>> prints the following prompt during an interactive SSH
>> session ('ssh host'):
>> 
>> 0;user <at> host:~(host:~)$ 
>> 
>> when PS1 is set to '(\h:\W)\$ ' on the remote host. 
>> 
>> The string '0;user <at> host:~' is not displayed when using
>> another terminal emulator.	
> 
> You probably set  PROMPT_COMMAND to something that term.el does not
> understand.

That's correct. It looks like PROMPT_COMMAND on the 
remote machine is trying to set the title string.

Should term.el support this escape sequence? If not,
should it recognize it but take no action (and also
not print undesired output)? This seems like a fairly
common feature, but I could be wrong.

Message #14 received at 5334 <at> debbugs.gnu.org (full text, mbox):

From: Dan Nicolaescu <dann <at> ics.uci.edu>
To: Scott Bell <sctb <at> me.com>
Cc: 5334 <at> debbugs.gnu.org
Subject: Re: bug#5334: 23.1.91; Term mode prints "0;
	user <at> host:~" before each prompt of an interactive SSH session
Date: Fri, 8 Jan 2010 11:13:23 -0800 (PST)

Scott Bell <sctb <at> me.com> writes:

  > On 2010-01-07, at 2:37 PM, Dan Nicolaescu wrote:
  > 
  > > Scott Bell <sctb <at> me.com> writes:
  > > 
  > >> Under GNU Emacs 23.1.91.1 (x86_64-apple-darwin10.2.0, 
  > >> NS apple-appkit-1038.25), Mac OS X 10.6.2, Term mode
  > >> prints the following prompt during an interactive SSH
  > >> session ('ssh host'):
  > >> 
  > >> 0;user <at> host:~(host:~)$ 
  > >> 
  > >> when PS1 is set to '(\h:\W)\$ ' on the remote host. 
  > >> 
  > >> The string '0;user <at> host:~' is not displayed when using
  > >> another terminal emulator.	
  > > 
  > > You probably set  PROMPT_COMMAND to something that term.el does not
  > > understand.
  > 
  > That's correct. It looks like PROMPT_COMMAND on the 
  > remote machine is trying to set the title string.

Does the PROMPT_COMMAND setting come from your .bashrc?
If yes, then:
1. never use it it's overkill, set PS1 to do the same thing instead.
2. when setting it, you need to set it conditionally, only when TERM==xterm

  > Should term.el support this escape sequence? If not,
  > should it recognize it but take no action (and also
  > not print undesired output)? This seems like a fairly
  > common feature, but I could be wrong.

That sequence should only be used for xterm.
It's been reported that this used to work in term.el in emacs-23.1, no
idea why it does not work now. I don't have any plans to figure out why
it does not work anymore, or to do anything about it.

Message #17 received at 5334 <at> debbugs.gnu.org (full text, mbox):

From: Scott Bell <sctb <at> me.com>
To: 5334 <at> debbugs.gnu.org
Subject: Re: bug#5334: 23.1.91; Term mode prints "0; user <at> host:~" before each
	prompt of an interactive SSH session
Date: Fri, 08 Jan 2010 12:25:17 -0700

On 2010-01-08, at 12:13 PM, Dan Nicolaescu wrote:

> Scott Bell <sctb <at> me.com> writes:
> 
>> On 2010-01-07, at 2:37 PM, Dan Nicolaescu wrote:
>> 
>>> Scott Bell <sctb <at> me.com> writes:
>>> 
>>>> Under GNU Emacs 23.1.91.1 (x86_64-apple-darwin10.2.0, 
>>>> NS apple-appkit-1038.25), Mac OS X 10.6.2, Term mode
>>>> prints the following prompt during an interactive SSH
>>>> session ('ssh host'):
>>>> 
>>>> 0;user <at> host:~(host:~)$ 
>>>> 
>>>> when PS1 is set to '(\h:\W)\$ ' on the remote host. 
>>>> 
>>>> The string '0;user <at> host:~' is not displayed when using
>>>> another terminal emulator.	
>>> 
>>> You probably set  PROMPT_COMMAND to something that term.el does not
>>> understand.
>> 
>> That's correct. It looks like PROMPT_COMMAND on the 
>> remote machine is trying to set the title string.
> 
> Does the PROMPT_COMMAND setting come from your .bashrc?
> If yes, then:
> 1. never use it it's overkill, set PS1 to do the same thing instead.
> 2. when setting it, you need to set it conditionally, only when TERM==xterm

It comes from the system bash initialization, I've now 
added PROMPT_COMMAND='' in my .bashrc on the remote 
machine.

>> Should term.el support this escape sequence? If not,
>> should it recognize it but take no action (and also
>> not print undesired output)? This seems like a fairly
>> common feature, but I could be wrong.
> 
> That sequence should only be used for xterm.
> It's been reported that this used to work in term.el in emacs-23.1, no
> idea why it does not work now. I don't have any plans to figure out why
> it does not work anymore, or to do anything about it.

That's certainly fine by me.

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