PowerShell for Windows Updates

gistfile1.txt

#Scan for available updates
function Get-AvailableUpdates {
  [CmdletBinding()]
  param()
  $ci = New-CimInstance -Namespace root/Microsoft/Windows/WindowsUpdate -ClassName MSFT_WUOperationsSession  
  $result = $ci | Invoke-CimMethod -MethodName ScanForUpdates -Arguments @{SearchCriteria="IsInstalled=0";OnlineScan=$true}
  $result.Updates
}


#Install all available updates
 function Install-AvailableUpdates {
 [CmdletBinding()]
 param()
 $ci = New-CimInstance -Namespace root/Microsoft/Windows/WindowsUpdate -ClassName MSFT_WUOperationsSession
 Invoke-CimMethod -InputObject $ci -MethodName ApplyApplicableUpdates
 }


#list installed updates
 function Get-InstalledUpdates {
 [CmdletBinding()]
 param()
 $ci = New-CimInstance -Namespace root/Microsoft/Windows/WindowsUpdate -ClassName MSFT_WUOperationsSession
 $result = $ci | Invoke-CimMethod -MethodName ScanForUpdates -Arguments @{SearchCriteria="IsInstalled=1";OnlineScan=$true}
 $result.Updates
 }

# From <https://richardspowershellblog.wordpress.com/2016/12/22/applying-updates-through-wsus/>