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Date: Tue, 17 Jun 2014 09:45:03 +0100
From: GrahamC <grahamc001uk AT yahoo DOT co DOT uk>
Reply-To: GrahamC <grahamc001uk AT yahoo DOT co DOT uk>
Subject: Re: Change PS1 when running as administrator
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
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> Frank Fesevur writes:
>> When I run as administrator I change my PS1 from "$" to "#" with these
>> line in ~/.bashrc.
>>
>> if id -Gn | grep -i Administrators > /dev/null
>
> If anything I'd check for membership in group 544.  "Administrators"
> surely is one of these strings that gets localized depending on the
> phase of the moon or something.  I can't look right now, but I'm pretty
> sure it says "Administratoren" in a german Windows version.

> On all my Dutch Windows all group names are localized apart from
> 544/Administrators.

># id
>uid=1000(Frank) gid=513(Geen)
>groups=513(Geen),0(root),544(Administrators),545(Gebruikers)

>But I agree checking the numeric value is better.

>> If more people like this idea, maybe it could included in /etc/bash.bashrc?
>
> I'll have to think about it, but I lean toward putting it into profile.d
> instead.

>Thanks for considering.
>The other PS1 setting (user AT host dir) is also in bash.bashrc. That's
>why I suggested bash.bashrc.

>Regards,
>Frank

If we are looking for other alternatives the GROUPS environment variable can also be used:

PS1='\[\e]0;\w\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]\n\$ '
for G in "${GROUPS[@]}"; do
    if [ "$G" = 544 ]; then
        PS1='\[\e]0;Administrator \w\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]\n# '
    fi
done

Somebody really clever with regular expressions could probably make an equivalent one line test.

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