Using Powershell to delete all users from the Portal

#----------------------------------------------------------------------------------------------------------
 set-variable -name URI -value "http://localhost:5725/resourcemanagementservice' " -option constant 
#----------------------------------------------------------------------------------------------------------function DeleteObject
 {
    PARAM($objectType, $objectId)
    END
    {
       $importObject = New-Object Microsoft.ResourceManagement.Automation.ObjectModel.ImportObject
       $importObject.ObjectType = $objectType
       $importObject.TargetObjectIdentifier = $objectId
       $importObject.SourceObjectIdentifier = $objectId
       $importObject.State = 2 
       $importObject | Import-FIMConfig -uri $URI
     } 
 }
#----------------------------------------------------------------------------------------------------------if(@(get-pssnapin | where-object {$_.Name -eq "FIMAutomation"} ).count -eq 0) {add-pssnapin FIMAutomation}
 $allobjects = export-fimconfig -uri $URI `–onlyBaseResources `
                                -customconfig "/Person"
 $allobjects | Foreach-Object {
    $displayName = $_.ResourceManagementObject.ResourceManagementAttributes | `
                      Where-Object {$_.AttributeName -eq "DisplayName"}    if([string]::Compare($displayName.Value, "Administrator", $True) -eq 0)
    {write-host "Administrator NOT deleted"}

    elseif([string]::Compare($displayName.Value, "Built-in Synchronization Account", $True) -eq 0)
    {write-host "Built-in Synchronization Account NOT deleted"}else { 
      $objectId = (($_.ResourceManagementObject.ObjectIdentifier).split(":"))[2]
      DeleteObject -objectType "Person" `
                   -objectId $objectId

      write-host "`nObject deleted`n"  $displayName.Value }
 }