@mitu They don't work at all. :(
I ran through the install instructions posted on the main page twice to be sure. Fresh RetroPie install on a 32GB card, updated everything RetroPie then right to the shutdown scripts. No go. So I did it again with a fresh install with no updates. Still no go. I also used Putty so I could copy and paste the commands with no chance of incorrectly typing them in.
The former dev said he hasn't touched them in over 16 months.
EDIT for added info