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Re: Change PS1 when run as administrator


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@host part of the prompt and to change the $ character to a #:
> > 
> >     if id | grep -qi 'member of administrators group'
> >     then
> >         export PS1=$(echo "$PS1" | sed -e 's_32_31_' -e 's_\\\$_#_')
> >     fi
> > 
> > IÂm not certain the string match on the output of id(1) works everywhere.  Is there a better way to check for admin privileges under Cygwin?  You canÂt check for UID or EUID == 0, for example, as youÂd do on a true POSIX system.
> 
> Ha!  Yes, there is:  see
> https://cygwin.com/ml/cygwin/2015-02/msg00057.html.  The magic test is
> 
> id -G | grep -qE '\<(544|0)\>'
> 
> where 544 is the Administrators group, and 0 is the root group in case the
> old root group entry is present in /etc/group.
> 
> For example:
> 
> 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

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

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