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Subject:	Re: Change PS1 when run as administrator
To:	cygwin AT cygwin DOT com
References:	<F7CDFE45-BFA7-4599-B510-B40BCA19142F AT etr-usa DOT com> <98egebtkn3kakah2g5m9nhr393mag7qm8j AT 4ax DOT com> <20160315170819 DOT GA11488 AT calimero DOT vinschen DOT de>
From:	Thomas Wolff <towo AT towo DOT net>
Message-ID:	<56E87FF2.3080100@towo.net>
Date:	Tue, 15 Mar 2016 22:34:42 +0100
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Am 15.03.2016 um 18:08 schrieb Corinna Vinschen:
> 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 #:
>>>
>>>      if id | grep -qi 'member of administrators group'
>>>      then
>>>          export PS1=$(echo "$PS1" | sed -e 's_32_31_' -e 's_\\\$_#_')
>>>      fi
>>>
>>> IÂ’m 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 canÂ’t check for UID or EUID == 0, for example, as youÂ’d 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.
So id -G | grep -q '\<544\>' I suppose. Is there also a universal 
replacement for
     elif id | grep -e "gid=.*(Power Users)" > /dev/null
?
Thomas

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