Kill a VM via SSH on ESXi5

esxcli vm process list

note the World ID number then

esxcli vm process kill --type hard --world-id xxxxx

where xxxxx is the World ID number

Disable SSH warning on ESXi4

In vSphere 4.1 Update 2 and later, perform these steps on individual hosts to disable the warnings: 

1. Open a VI Client to the ESXi host
2. Select the ESXi host from the Inventory.
3. Select Configuration tab Advanced Settings from the Software menu.
4. Navigate to UserVars > UserVars.SupressShellWarning.
5. Set the value from 0 to 1.
6. Click OK.