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If you don’t have console access to your ESXi host but have SSH connectivity, use the following commands to restart and shutdown the host.

To shutdown type :

poweroff

The reboot command usage is as follows :
Usage: reboot [-d<delay>] [-n<nosync>] [-f<force>]

Options:

 -d delay interval for rebooting
 -n no call to sync()
 -f force reboot(don’t go through init)

EG. reboot -d 0 -f (force reboot now - no delay)