## =====================================================================  
 ## Title       : Shutdown running VM's 
 ## Description : Script to shutdown all runnning guests in a virtual infrastructure
 ## Author     : Marco Baars
 ## January 2010
 ## =====================================================================  
 
 add-pssnapin VMware.VimAutomation.Core
 
 # Connect to Virtual Center server
 $VIserver = "viserver"
 Connect-VIServer $VIserver  
 
 
 # Run trough all guests
 $VMarray = Get-VM 
 cls
 foreach ($item in $VMarray) 
 {
   if ($Item.Powerstate -eq  "Poweredon") 
   {
     $ServerName = $Item.Name
     "Server " + $ServerName +  " is powered on"
     "Shutting down " + $ServerName
 
     # The VMware way (simulates power button)
     # Get-VM $Item.Name | Shutdown-VMGuest -Confirm  
 
     # This one suspends the virtual machine
     # Get-VM $Item.Name | Suspend-VMGuest 
 
     # Shutdown the Windows way via WMI
     $win32OS = get-wmiobject win32_operatingsystem -computername $ServerName 
     $win32OS.psbase.Scope.Options.EnablePrivileges = $true
     $win32OS.win32shutdown(1)
   } 
 
 }