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Re: Change PS1 when run as administrator
- From: Thomas Wolff <towo at towo dot net>
- To: cygwin at cygwin dot com
- Date: Tue, 15 Mar 2016 22:34:42 +0100
- Subject: Re: Change PS1 when run as administrator
- Authentication-results: sourceware.org; auth=none
- 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>
Am 15.03.2016 um 18:08 schrieb Corinna Vinschen:
So id -G | grep -q '\<544\>' I suppose. Is there also a universal
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'
export PS1=$(echo "$PS1" | sed -e 's_32_31_' -e 's_\\\$_#_')
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.
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.
elif id | grep -e "gid=.*(Power Users)" > /dev/null
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