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Date: Tue, 15 Mar 2016 18:08:19 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Change PS1 when run as administrator
Message-ID: <20160315170819.GA11488@calimero.vinschen.de>
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References: <F7CDFE45-BFA7-4599-B510-B40BCA19142F AT etr-usa DOT com> <98egebtkn3kakah2g5m9nhr393mag7qm8j AT 4ax DOT com>
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On Mar 15 12:33, Andrew Schulman wrote:
> > I just came up with this recipe to change the default PS1 value to use =
red for the user AT host part of the prompt and to change the $ character to a=
 #:
> >=20
> >     if id | grep -qi 'member of administrators group'
> >     then
> >         export PS1=3D$(echo "$PS1" | sed -e 's_32_31_' -e 's_\\\$_#_')
> >     fi
> >=20
> > I=C2=92m not certain the string match on the output of id(1) works ever=
ywhere.  Is there a better way to check for admin privileges under Cygwin? =
 You can=C2=92t check for UID or EUID =3D=3D 0, for example, as you=C2=92d =
do on a true POSIX system.
>=20
> Ha!  Yes, there is:  see
> https://cygwin.com/ml/cygwin/2015-02/msg00057.html.  The magic test is
>=20
> id -G | grep -qE '\<(544|0)\>'
>=20
> where 544 is the Administrators group, and 0 is the root group in case the
> old root group entry is present in /etc/group.
>=20
> For example:
>=20
> id -G | grep -qE '\<(544|0)\>' && echo admin || echo user

Thou shalt not use the test for gid 0 anymore.  If it works, remove the
entry from /etc/group, or better, remove /etc/group entirely.  This entry
will render wrong and unwanted results when you least expect them.  Such
cruft always does.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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