Cygwin console: Different default background color when terminal runs as Admin?

[Thomas Wolff]

Am 18.08.2023 um 10:11 schrieb Christian Franke via Cygwin:
> Jonathon Merz via Cygwin wrote:
>> On Thu, Aug 17, 2023 at 7:13 PM Martin Wege via Cygwin 
>> <cygwin@cygwin.com>
>> wrote:
>>
>>> Just an idea: Could the default background color of the Cygwin console
>>> be changed from black to grey (or RED) if the terminal has been
>>> started with Administrator rights?
>>>
>> Assuming that:
>> 1. The Administrators group is called "Administrators"
>> 2. There aren't any non-administrative groups with "Administrators" 
>> in the
>> name
>> 3. You're using mintty for your terminal
>>
>> You can run the following in bash or zsh with the desired RGB values:
>>
>> if [[ `id -Gn` == *Administrators* ]]
>> then
>>      echo -ne "\e]11;#FFBBEE\a";
>> fi
>
> A alternative that should work with any shell, does not rely on 
> (unfortunately localized) group names and only assumes that the 
> Administrators group S-1-5-32-544 isn't remapped by /etc/group:
>
> case " $(/usr/bin/id -G) " in
>   *\ 544\ *) printf '\e]11;#FFFF80\a' ;;
> esac
or like this
case " `id -G` " in
*" 544 "*|*" 0 "*)    echo admin;;
esac
Note the embedding spaces in the case expression.
I'm adding the 0 for a profile portable with Linux.
You could also use
     if id -G | grep -qE '\<(544|0)\>'
at the cost of an additional process creation.
In earlier Windows versions, you could also check for group 547 which 
was some kind of half-admin user.

Thomas

>
> Or use a check of actual access rights:
>
> if [ -r /proc/registry/HKEY_LOCAL_MACHINE/SAM/SAM ]; then ...; fi
>
>
> I use this in .bashrc to add "(root)" to the default mintty title and 
> set '#' as root prompt:
>
> case " $(/usr/bin/id -G) " in
>   *\ 544\ *) PS1=${PS1/\\e]0;\\w/\\e]0;\\w (root)}; PS1=${PS1/\\\$ /\# 
> } ;;
> esac
>