Scripts/Get-PSWSUSUpdateSummaryPerClient.ps1

function Get-PSWSUSUpdateSummaryPerClient {
    <#
    .SYNOPSIS
        Gets the summary of all updates for a client
         
    .DESCRIPTION
       Gets the summary of all updates for a client
     
    .PARAMETER ComputerScope
        Specified scope of computers to perform query against
         
    .PARAMETER UpdateScope
        Specified scope of updates to perform query against
         
    .NOTES
        Name: Get-PSWSUSUpdateSummaryForClient
        Author: Boe Prox
        DateCreated: 23NOV2011
        DateModified: 21 July 2015
                
    .LINK
        https://learn-powershell.net
         
    .EXAMPLE
    Get-PSWSUSUpdateSummaryPerClient -ComputerScope (New-PSWSUSComputerScope) -UpdateScope (New-PSWSUSUpdateScope)
 
    Computer InstalledCount NeededCount FailedCount
    -------- -------------- ----------- -----------
    Server1 108 8 0
    Server2 99 9 0
    Server3 184 13 0
    Server4 98 5 14
    Server5 151 8 0
    Server6 128 7 0
    Server7 154 9 0
    Server8 151 8 0
    Server9 155 8 0
    Server10 149 12 0
 
    Description
    -----------
    Displays a summary for each client and their number of installed, needed and failed updates.
  
    #>
 
    [cmdletbinding(
        ConfirmImpact = 'low'
    )]
    Param(
        [Parameter(Position = 0)]
        [Microsoft.UpdateServices.Administration.ComputerTargetScope]$ComputerScope,
        [Parameter(Position = 1)]
        [Microsoft.UpdateServices.Administration.UpdateScope]$UpdateScope                                                                                          
    )
    Begin {                
        $ErrorActionPreference = 'stop'
        $hash = @{}
    }
    Process {
        If ($PSBoundParameters['UpdateScope']) {
            Write-Verbose "Adding update scope to table"
            $hash['UpdateScope'] = $UpdateScope
        } Else {
            Write-Verbose "Using default update scope"
            $hash['UpdateScope'] = New-PSWSUSUpdateScope
        }
        If ($PSBoundParameters['ComputerScope']) {
            Write-Verbose "Adding Computer scope to table"
            $hash['ComputerScope'] = $ComputerScope
        } Else {
            Write-Verbose "Using default Computer scope"
            $hash['ComputerScope'] = New-PSWSUSComputerScope
        }
        Write-Verbose ('Performing query based on scopes')
        $wsus.GetSummariesPerComputerTarget($hash['UpdateScope'],$hash['ComputerScope']) | ForEach {
            $_.pstypenames.insert(0,'Microsoft.UpdateServices.Internal.BaseApi.UpdateSummary.Client')
            $_
        }
    }  
    End {
        $ErrorActionPreference = 'continue'    
    } 
}