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Date: Tue, 15 Mar 2016 20:23:54 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
Reply-To: cygwin AT cygwin DOT com
Message-ID: <28210846.20160315202354@yandex.ru>
To: Warren Young <wyml AT etr-usa DOT com>, cygwin AT cygwin DOT com
Subject: Re: Change PS1 when run as administrator
In-Reply-To: <F7CDFE45-BFA7-4599-B510-B40BCA19142F@etr-usa.com>
References: <F7CDFE45-BFA7-4599-B510-B40BCA19142F AT etr-usa DOT com>
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Greetings, Warren Young!

> 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

> I’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 can’t
> check for UID or EUID == 0, for example, as you’d do on a true POSIX system.

> Perhaps something like this should go into the default /etc/profile?

PS1_TAIL="$(
  x="$"
  for group in $(id -G); do 
  {
    test $group -eq 114 && { x="#"; break; }
    test $group -eq 544 && { x="#"; break; }
    test $group -eq 0 && { x="Please remove well-known SID overrides from your /etc/group file#"; break; }
  }
  done
  echo $x
  )"
if [ "$color_prompt" = yes ]; then
    PS1='\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\007\]\n$PS1_TAIL '
else
    PS1='\u@\h:\w\007\n$PS1_TAIL '
fi
unset color_prompt force_color_prompt

# If this is an xterm set the title to user AT host:dir
case "$TERM" in
xterm*|rxvt*|putty*)
    PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD/$HOME/~}\007"'
    ;;
*)
    ;;
esac


-- 
With best regards,
Andrey Repin
Tuesday, March 15, 2016 20:23:26

Sorry for my terrible english...