for full details.
I don't understand how I can get a doubleprompt, one immediately after another. The second is caused by /etc/bashrc and appears as a grey-white in a raw console whereas the first prompt is brilliant white. Both prompts can carry current directory information.
The first half of the above link is a copy and paste of the console with an annotation half way. The end shows the salient points of the scripts and where to find the full scripts.