Update

Examples/Example-16-KeepPermissions02.ps1

@@ -6,7 +6,7 @@ Invoke-GPOZaurrPermission -Verbose -Linked Root -IncludeDomains 'ad.evotec.pl' {
     Remove-GPOPermission -Type NotAdministrative, NotWellKnownAdministrative -IncludePermissionType GpoEdit, GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type Administrative -IncludePermissionType GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type AuthenticatedUsers -IncludePermissionType GpoRead -PermitType Allow
-} -WhatIf
+} -WhatIf -SkipDuplicates
 
 
 # Apply perrmissions for Domain Controllers
@@ -15,7 +15,7 @@ Invoke-GPOZaurrPermission -Verbose -Linked DomainControllers -IncludeDomains 'ad
     Remove-GPOPermission -Type NotAdministrative, NotWellKnownAdministrative -IncludePermissionType GpoEdit, GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type Administrative -IncludePermissionType GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type AuthenticatedUsers -IncludePermissionType GpoRead -PermitType Allow
-} -WhatIf
+} -WhatIf -SkipDuplicates
 
 # Apply permissions for Regions, with exclusions for those 4 groups
 $Exclude = @(
@@ -27,7 +27,8 @@ Invoke-GPOZaurrPermission -Verbose -SearchBase 'OU=ITR01,DC=ad,DC=evotec,DC=xyz'
     Remove-GPOPermission -Type NotAdministrative, NotWellKnownAdministrative -IncludePermissionType GpoEdit, GpoEditDeleteModifySecurity -PermitType Allow -ExcludePrincipal $Exclude -ExcludePrincipalType DistinguishedName
     Add-GPOPermission -Type Administrative -IncludePermissionType GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type AuthenticatedUsers -IncludePermissionType GpoRead -PermitType Allow
-} #-WhatIf
+} -WhatIf -SkipDuplicates
+
 
 $Exclude = @(
     'CN=ITR02_AD Admins,OU=Security,OU=Groups,OU=Production,DC=ad,DC=evotec,DC=xyz'
@@ -40,4 +41,4 @@ Invoke-GPOZaurrPermission -Verbose -SearchBase 'OU=ITR02,DC=ad,DC=evotec,DC=xyz'
     Remove-GPOPermission -Type NotAdministrative, NotWellKnownAdministrative -IncludePermissionType GpoEdit, GpoEditDeleteModifySecurity -PermitType Allow -ExcludePrincipal $Exclude -ExcludePrincipalType DistinguishedName
     Add-GPOPermission -Type Administrative -IncludePermissionType GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type AuthenticatedUsers -IncludePermissionType GpoRead -PermitType Allow
-} #-WhatIf
+} -WhatIf -SkipDuplicates

GPOZaurr.psd1

@@ -7,7 +7,7 @@
     Description          = 'Group Policy Eater'
     FunctionsToExport    = 'Add-GPOPermission', 'Add-GPOZaurrPermission', 'Backup-GPOZaurr', 'Get-GPOZaurr', 'Get-GPOZaurrAD', 'Get-GPOZaurrBackupInformation', 'Get-GPOZaurrLegacyFiles', 'Get-GPOZaurrLink', 'Get-GPOZaurrLinkSummary', 'Get-GPOZaurrOwner', 'Get-GPOZaurrPassword', 'Get-GPOZaurrPermission', 'Get-GPOZaurrPermissionConsistency', 'Get-GPOZaurrSysvol', 'Get-WMIFilter', 'Get-GPOZaurrWMI', 'Invoke-GPOZaurrPermission', 'New-GPOZaurrWMI', 'Remove-GPOPermission', 'Remove-GPOZaurr', 'Remove-GPOZaurrLegacyFiles', 'Remove-GPOZaurrOrphanedSysvolFolders', 'Remove-GPOZaurrPermission', 'Remove-GPOZaurrWMI', 'Repair-GPOZaurrPermissionConsistency', 'Restore-GPOZaurr', 'Save-GPOZaurrFiles', 'Set-GPOOwner', 'Set-GPOZaurrOwner'
     GUID                 = 'f7d4c9e4-0298-4f51-ad77-e8e3febebbde'
-    ModuleVersion        = '0.0.40'
+    ModuleVersion        = '0.0.41'
     PowerShellVersion    = '5.1'
     PrivateData          = @{
         PSData = @{

Public/Invoke-GPOZaurrPermission.ps1

@@ -118,7 +118,14 @@
         [parameter(ParameterSetName = 'ADObject')]
         [parameter(ParameterSetName = 'Linked')]
         [parameter(ParameterSetName = 'Level')]
-        [switch] $LimitAdministrativeGroupsToDomain
+        [switch] $LimitAdministrativeGroupsToDomain,
+
+        [Parameter(ParameterSetName = 'GPOGUID')]
+        [Parameter(ParameterSetName = 'GPOName')]
+        [parameter(ParameterSetName = 'Filter')]
+        [parameter(ParameterSetName = 'ADObject')]
+        [parameter(ParameterSetName = 'Linked')]
+        [switch] $SkipDuplicates
     )
     if ($PermissionRules) {
         $Rules = & $PermissionRules
@@ -139,6 +146,7 @@
             IncludeDomains            = $IncludeDomains
             ExcludeDomains            = $ExcludeDomains
             ExtendedForestInformation = $ForestInformation
+            SkipDuplicates            = $SkipDuplicates.IsPresent
         }
         if ($ADObject) {
             $Splat['ADObject'] = $ADObject

README.md

@@ -39,6 +39,8 @@ That's it. Whenever there's a new version, you run the command, and you can enjo
 
 ## Changelog
 
+- 0.0.41 - 18.06.2020
+  - Added paramerter `SkipDuplicates` to `Invoke-GPOZaurrPermission` which prevents applying permissions over and over again if 1 GPO is linked to a multiple OU's within another OU
 - 0.0.40 - 18.06.2020
   - Fix for error `Get-GPOZaurrLink` - same issue as described on my [earlier blog - Get-ADObject : The server has returned the following error: invalid enumeration context.](https://evotec.xyz/get-adobject-the-server-has-returned-the-following-error-invalid-enumeration-context/).
     - `WARNING: Get-GPOZaurrLink - Processing error The server has returned the following error: invalid enumeration context.`