The following links are to download the pdfs for vmware.
Vmware ESX cheat sheet
ESX Maintenance Mode via Command Line
To enter Maintenance Mode, at the ESX console type:
vimsh -n -e /hostsvc/maintenance_mode_enter
To exit Maintenance Mode type:
vimsh -n -e /hostsvc/maintenance_mode_exit
To display whether the ESX Server is currently in maintenance mode or not type:
vimsh -n -e"hostsvc/hostsummary" | grep inMaintenanceMode
