SCCM – PowerShell to Check Windows Updates and Install Them on Computer

Here are two PowerShell scripts, one that checks what updates have been delivered to a computer via SCCM and the second that invokes the installation of them.
Why do you ask? Well I build servers and need to make sure all windows updates (to an approved released are installed on the newly built computer).
This can take a while for SCCM client to get its act together and download them. These two scripts allow me to easily check the status of a computer and initiate the installation remotely.

Get-UpdatesAvailableOnServer.ps1 lists the updates ready for installation

#Requires -RunAsAdministrator 
<#
.Synopsis
   Lists available Windows Updates on the Server that have been delivered via SCCM
.DESCRIPTION
   Lists available Windows Updates on the Server that have been delivered via SCCM. 
   This does NOT list what should be installed on server. You should use MSBA on the server for that.
.EXAMPLE
   Get-UpdatesAvailableOnServer -ComputerName Server1
.EXAMPLE
   Get-UpdatesAvailableOnServer
   This will prompt you for ComputerName to check
.AUTHOR
   http://britv8.com
   Version 2 - Returns Powershell object rather than just Write-Output, for more usability
#>

    Param
    (
        # Pass the Server name 
        [Parameter(Mandatory=$true,
                   ValueFromPipelineByPropertyName=$true,
                   Position=0)]
        $ComputerName
        
    )

    Begin
    {

    }
    Process
    {
   
    # This is a simple get of all instances of CCM_SoftwareUpdate from root\CCM\ClientSDK 
    $MissingUpdates = Get-WmiObject -Class CCM_SoftwareUpdate -Filter ComplianceState=0 -Namespace root\CCM\ClientSDK -Computername $ComputerName

    foreach ($item in $MissingUpdates)
    {
        $object   = New-Object –TypeName PSObject –Prop ([ordered]@{
                Computername                = $Computername
                ArticleID                   = $item.ArticleID
                Name                        = $item.Name
                URL                         = $item.URL
                })
    $object   
    }
   

    }
    End
    {
    }

Invoke-UpdatesAvailableOnServer.ps1 lists the updates ready for installation AND kicks off the installation process

<#
.Synopsis
   Invokes the installation of available Windows Updates on the Server that have been delivered via SCCM
.DESCRIPTION
   Invokes the installation of available Windows Updates on the Server that have been delivered via SCCM. 
.EXAMPLE
   Invoke-UpdatesAvailableOnServer -ServerName Server1
.EXAMPLE
   Invoke-UpdatesAvailableOnServer
   This will prompt you for Servername to check
.AUTHOR
   http://britv8.com
#>

    Param
    (
        # Pass the Server name 
        [Parameter(Mandatory=$true,
                   ValueFromPipelineByPropertyName=$true,
                   Position=0)]
        $ServerName
        
    )

    Begin
    {
  
    }
    Process
    {
   
    # This is a simple get of all instances of CCM_SoftwareUpdate from root\CCM\ClientSDK 
    $MissingUpdates = Get-WmiObject -Class CCM_SoftwareUpdate -Filter ComplianceState=0 -Namespace root\CCM\ClientSDK -Computername $ServerName
    Write-host "List of Updates Available for install on Server $ServerName"
    foreach ($item in $MissingUpdates)
    {
        Write-Host $item.ArticleID $item.Name $item.URL   
    }
   
    # The following is done to do 2 things: Get the missing updates (ComplianceState=0)  
    # and take the PowerShell object and turn it into an array of WMI objects 
    $MissingUpdatesReformatted = @($MissingUpdates | ForEach-Object {if($_.ComplianceState -eq 0){[WMI]$_.__PATH}}) 
 
    # The following is the invoke of the CCM_SoftwareUpdatesManager.InstallUpdates with our found updates 
    # NOTE: the command in the ArgumentList is intentional, as it flattens the Object into a System.Array for us 
    # The WMI method requires it in this format. 
    $InstallReturn = Invoke-WmiMethod -Class CCM_SoftwareUpdatesManager -Name InstallUpdates -ArgumentList (,$MissingUpdatesReformatted) -Namespace root\ccm\clientsdk -Computername $ServerName
    Write-host "Install of updates initiated on Server $ServerName , A Manual reboot will be required once updates installed" 
    }
    End
    {
    }

Source for these was based on https://gallery.technet.microsoft.com/scriptcenter/Install-All-Missing-8ffbd525
I just split it out into just a read, then an invoke.
Also enabled it to be run against a remote computer.