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Subject:	Re: Change PS1 when run as administrator
From:	Warren Young <wyml AT etr-usa DOT com>
In-Reply-To:	<28210846.20160315202354@yandex.ru>
Date:	Tue, 15 Mar 2016 13:45:33 -0600
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On Mar 15, 2016, at 11:23 AM, Andrey Repin <anrdaemon AT yandex DOT ru> wrote:
> 
> PS1_TAIL="$(
>  x="$"
>  for group in $(id -G); do 
>  {
>    test $group -eq 114 && { x="#"; break; }
>    test $group -eq 544 && { x="#"; break; }
>    test $group -eq 0 && { x="Please remove well-known SID overrides from your /etc/group file#"; break; }
>  }
>  done
>  echo $x
>  )"
> if [ "$color_prompt" = yes ]; then
>    PS1='\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\007\]\n$PS1_TAIL '
> else
>    PS1='\u@\h:\w\007\n$PS1_TAIL '
> fi
> unset color_prompt force_color_prompt

Here’s a simpler version that’s closer to the stock version in color and style, with the quoting errors fixed:

PS1_COLOR=32
PS1_PCHAR='$'
for group in $(id -G); do
   test $group -eq 114 && { PS1_PCHAR='#'; PS1_COLOR=31; break; }
   test $group -eq 544 && { PS1_PCHAR='#'; PS1_COLOR=31; break; }
   test $group -eq 0   && { PS1_PCHAR='!'; PS1_COLOR=41; break; }
done
PS1='\[\e]0;\w\a\]\n\[\e['$PS1_COLOR'm\]\u@\h '
PS1=$PS1'\[\e[33m\]\w\[\e[0m\]\n'$PS1_PCHAR' '


I’ve split the last line to avoid wrapping.

I’ve gone with the “check engine light” approach to error reporting for the GID=0 case.

If someone wants to apply this to Cygwin’s stock /etc files, it needs to go in /etc/bash.bashrc in Cygwin, not /etc/profile.
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