Having not used the ESXi command line as often as I should, I logged in and found myself in an unfamiliar place. My objective was to enter maintenance mode, reboot the host, and exit maintenance mode.
ESXi CLI Enter Maintenance Mode
ESXi CLI Exit Maintenance Mode
ESXi CLI Reboot the host
Ok, so reboot should have been obvious, however, being used to running shutdown -r nowâ€¦ it was not so much.
I adapted the maintenance mode commands from here: http://www.virtualizetips.com/2010/05/how-to-enable-maintenance-mode-on-esx-host-from-command-line/