Every time I look at PowerShell v3 I seem to find a new way to access WMI!

I’ve covered the –ComputerName and –CimSession parameters before but to recap

We duplicate the way Get-WmiObject works:

$computer = $env:COMPUTERNAME
Get-CimInstance -ClassName Win32_OperatingSystem -ComputerName $computer


We can use CIM sessions
$cs = New-CimSession -ComputerName $computer
Get-CimInstance -ClassName Win32_OperatingSystem -CimSession $cs


One little known and little used capability in PowerShell v2 was the WSMAN cmdlets. These enable us to access WMI directly over WSMAN

$ruri = “http://schemas.microsoft.com/wbem/wsman/1/wmi/root/cimv2/Win32_OperatingSystem”
Get-WSManInstance -ResourceURI $ruri -ComputerName $computer

This is fine for a single returned instance but where there are multiples eg disks we need to do a bit more work

$ruri = http://schemas.microsoft.com/wbem/wsman/1/wmi/root/cimv2/Win32_LogicalDisk

Get-WSManInstance -ResourceURI $ruri -ComputerName $computer -Enumerate |
select DeviceId, Description

It turns out that we can use these ResourceURIs with Get-CimInstance

$ruri = http://schemas.microsoft.com/wbem/wsman/1/wmi/root/cimv2/Win32_OperatingSystem

Get-CimInstance -ResourceUri $ruri -ComputerName $computer
Get-CimInstance -ResourceUri $ruri -CimSession $cs

Better still if we are going after multiple instances

$ruri = “http://schemas.microsoft.com/wbem/wsman/1/wmi/root/cimv2/Win32_LogicalDisk”
Get-CimInstance -ResourceUri $ruri -ComputerName $computer |
select DeviceId, Description

Get-CimInstance -ResourceUri $ruri -CimSession $cs |
select DeviceId, Description

You have to use –ComputerName OR –CimSession if you use –ResourceURI.  If you don’t you make a DCOM connection to the local machine and you request will fail. You also won’t be able to use –ResourceURI if your CIM session is over DCOM

This entry was posted in PowerShell and WMI, PowerShell V3. Bookmark the permalink.

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