Script to delete unique permissions on all items/docs in a Document Library

[NaveedBajwa]

Is there a script or other way to delete ALL unique permissions across a document library and reset everything to inherit from parent?

[ToddKlindt]

I haven't ever done this, but in my head it looks something like this:

$ListList = (Get-PnPList -Includes IsSystemList).Where({$_.IsSystemList -EQ $false})
Foreach ($List in $ListList) {
   Get-PnPListItem -List $List | Set-PnPListItemPermission -InheritPermissions -List $List
}

Doublecheck it, but that should do it.

[NaveedBajwa]

Thanks Todd,
I am getting the following error

Get-PnPListItem : The attempted operation is prohibited because it exceeds the list view threshold.
At line:3 char:4

• Get-PnPListItem -List $List | Set-PnPListItemPermission -InheritPe ...

+ CategoryInfo          : WriteError: (:) [Get-PnPListItem], ServerException
+ FullyQualifiedErrorId : EXCEPTION,PnP.PowerShell.Commands.Lists.GetListItem

[ToddKlindt]

You have a large list. :) I don't have one handy to test with. Try replacing the line inside of the Foreach loop with this:

Get-PnPListItem -List $List -PageSize 1000 | Set-PnPListItemPermission -InheritPermissions -List $List
That should do it in batches of 1000.

[NaveedBajwa]

Legend - Worked like a Charm. Thanks a lot.