Remove redirect items that are no longer pointed at an existing item

RemoveInvalidRedirects.ps1

<#
    .SYNOPSIS
        Removes all Redirect URLs that do not have a valid destination
    
    .NOTES
        Alex Washtell
#>

# HasReference determines if the specified item is referenced by any other item.
filter NoValidDestination {

    $itemId = $_."Redirect To"
    
    if (!$itemId) {
        $_
    }
    else {
        $destination = get-item master: -ID $itemId
        
        if (!$destination) {
            $_
        }
    }

}

Get-ChildItem -Recurse | Where TemplateName -eq "Redirect Url" | NoValidDestination | Remove-Item