Q. The output from Get-WindowsFeature doesn't help me. How can I query whether a role or feature is installed?
A. By default, the output from Get-WindowsFeature shows a check box if a role or feature is installed, as shown here.
PS C:\> Get-WindowsFeature Hyper-V
Display Name Name
------------ ----
[X] Hyper-V Hyper-V
This matches the format of the servermanagercmd -query command but goes against what most people prefer with PowerShell, which is objects returned with properties you can easily query. You do have access to this kind of return, however. A property, Installed, is also returned. This property is a Boolean showing if the role or feature is installed. You can see this by formatting the output differently. For example
PS C:\> Get-WindowsFeature Hyper-V | ft DisplayName, Installed
DisplayName Installed
----------- ---------
Hyper-V True
PS C:\> Get-WindowsFeature DHCP | ft DisplayName, Installed
DisplayName Installed
----------- ---------
DHCP Server False
Here you can see that I queried for the DisplayName and Installed properties and a Boolean for the installation status was returned.
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