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  This script will find duplicate employeeID values and export them
  to a CSV file.

  Syntax examples:
    To process all users:

    To process all users from a particular OU structure:
      UpdatingEmployeeID.ps1 -SearchBase "OU=Users,OU=Corp,DC=mydemosthatrock,DC=com" -ReferenceFile "c:\MyOutput.csv"

    You must use quotes around the SearchBase parameter otherwise the
    comma will be replaced with a space. This is because the comma is a
    special symbol in PowerShell.

  Release 1.0
  Written by [email protected] 3rd April 2014


param([String]$SearchBase, [String]$ReferenceFile)

# Get the script path
$ScriptPath = { Split-Path $MyInvocation.ScriptName }

if ([String]::IsNullOrEmpty($ReferenceFile)) {
    $ReferenceFile = $(&$ScriptPath) + "\DuplicateEmployeeIDs.csv";

$UsedefaultNamingContext = $False
if ([String]::IsNullOrEmpty($SearchBase)) {
    $UsedefaultNamingContext = $True

# Import the Active Directory Module
Import-Module ActiveDirectory -WarningAction SilentlyContinue
if ($Error.Count -eq 0) {
    #Write-Host "Successfully loaded Active Directory Powershell's module" -ForeGroundColor Green
else {
    Write-Host "Error while loading Active Directory Powershell's module : $Error" -ForeGroundColor Red

$defaultNamingContext = (get-adrootdse).defaultnamingcontext
$DistinguishedName = (Get-ADDomain).DistinguishedName
$DomainName = (Get-ADDomain).NetBIOSName
$DNSRoot = (Get-ADDomain).DNSRoot

if ($UsedefaultNamingContext -eq $True) {
    $SearchBase = $defaultNamingContext
else {
    $TestSearchBase = Get-ADobject "$SearchBase"
    if ($Null -eq $TestSearchBase) {
        $SearchBase = $defaultNamingContext


function Get-LastLoggedOnDate ([string] $Date) {
    if ($Date -eq $NULL -OR $Date -eq "") {
        $Date = "Never logged on before"

$LastLoggedOnDate = @{Name = 'LastLoggedOnDate'; Expression = { Get-LastLoggedOnDate $_.LastLogonDate } }

$EmployeeID = @{Name = 'EmployeeID'; Expression = { $_.EmployeeID.Trim() } }

$TotalProcessed = 0
$filter = "(employeeID=*)"
Write-Host -ForegroundColor Green "Finding all users with an employeeID attribute and exporting the duplicates to '$ReferenceFile'`n"
Get-ADUser -LDAPFilter $filter -SearchBase $SearchBase -Properties * | Select-Object $EmployeeID, SamAccountName, Name, Enabled, $LastLoggedOnDate, whenCreated | Group-Object EmployeeID | Where-Object { $_.Count -gt 1 } | Select-Object -Expand Group | Export-Csv -notype "$ReferenceFile"

# Remove the quotes
(Get-Content "$ReferenceFile") | ForEach-Object { $_ -replace '"', "" } | Out-File "$ReferenceFile" -Force -Encoding ascii

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Please feel free to copy parts of the script or if you would like to download the entire script, simple click the download button. You can download the complete repository in a zip file by clicking the Download link in the menu bar on the left hand side of the page.

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