Alternate # and $ in between root and user shell prompts

A tiny bit of bash in the .bashrc does it.

This is a simple version with no colors, showing hostname and working directory before the $ or # symbol.

Let's put the bash bit at the end of our .bashrc
The bash bit
g0:~$cat .bashrc | tail -7

if [ $(whoami) = "root" ];then
        PS1="$(hostname):\\w#"
    else
        PS1="$(hostname):\\w$"
fi

let's put it in root's .bashrc as well 
g0:~$sudo bash
g0:~#cat /root/.bashrc |tail -7

if [ $(whoami) = "root" ];then
        PS1="$(hostname):\\w#"
    else
        PS1="$(hostname):\\w$"
fi

cool, now $ denotes a user and # denotes the root user
g0:~#whoami
root
g0:~#exit
exit
g0:~$whoami
g
g0:~$


We can also put it in /etc/skel/.bashrc so every new user from now has it in his .bashrc.
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