Host management commands can stop and reboot ESXi hosts, back up configuration information, and manage host updates. You can also use a host management command to make your host join an Active Directory domain or exit from a domain.
For information on updating ESXi 5.0 hosts with the esxcli software command and on changing the host acceptance level to match the level of a VIB that you might want to use for an update, see the vSphere Upgrade documentation in the vSphere 5.0 Documentation Center.