Windows Update Powershell Commands
From DFWLPiki
The PSWindowsUpdate set of commands is required.
Apply all available updates:
Set-ExecutionPolicy -ExecutionPolicy Bypass -Force Import-Module PSWindowsUpdate Get-WUInstall -AcceptAll
List all available updates
Set-ExecutionPolicy -ExecutionPolicy Bypass -Force Import-Module PSWindowsUpdate Get-WUList
Show Updates sources and which is default (Desired state is usually "true" for Windows Server Update Service)
Set-ExecutionPolicy -ExecutionPolicy Bypass -Force Import-Module PSWindowsUpdate Get-WUServiceManager