Compare PowerShell system module with their PowerShell gallery counterparts

Compare-SystemModuleWithGallery.ps1

<#
.Synopsis
   Compares system modules with available ones on powershell gallery
.DESCRIPTION
   Compares system modules with available ones on powershell gallery
.EXAMPLE
   Compare-SystemModuleWithGallery
.Link
    http://mikefrobbins.com/2016/06/09/update-manually-installed-powershell-modules-from-the-powershell-gallery/
#>
Function Global:Compare-SystemModuleWithGallery
{
    Get-Module -ListAvailable |
    Where-Object ModuleBase -like $env:ProgramFiles\WindowsPowerShell\Modules\* |
    Sort-Object -Property Name, Version -Descending |
    Get-Unique -PipelineVariable Module |
    ForEach-Object {
        if (-not(Test-Path -Path "$($_.ModuleBase)\PSGetModuleInfo.xml")) {
            Find-Module -Name $_.Name -OutVariable Repo -ErrorAction SilentlyContinue |
            Compare-Object -ReferenceObject $_ -Property Name, Version |
            Where-Object SideIndicator -eq '=>' |
            Select-Object -Property Name,
                                    @{label='InstalledVersion';expression={$Module.Version}},
                                    @{label='Repository';expression={$Repo.Repository}},
                                    Version
        }
    }
}