How to exit the Imaging shell

After I do a manual image, what is the correct command to get the WS to
reboot out of the ZfD imaging shell? At the bash prompt I type 'exit'
once and nothing happens. Then I type 'exit' again and I get "An error
occurred during the installation". If I hit enter on the 'OK' button I
get back to the Main Menu. Is there a quicker way to get it to just
reboot or shut down the PC?

Dan