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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
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Subject: Re: [TRAMP] Setting remote prompt
Date: Tue, 24 Apr 2018 11:35:05 +0100
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"Loris Bennett" <loris.bennett@fu-berlin.de> writes:
<snip>
> The extraneous symbols were coming from the following fragment
>
>   \[\033]2;\u@\h\a\]
>
> which seems to be some sort of attempt to use the text attribute "dim"
> (2;), which is ignored or not displayed for most of my terminals, but
> produces

No.  Leaving the enclosing []s aside, the sequence is

  ESC ] 2; <string> BEL

with \033 being ESC and \a being BEL.  This sequence is used to set the
window title.

-- 
Ben.