Recursively set permissions on folders using Powershell?

Question

I have a directory which I want to go through recursively and set permissions on all the folders. So the order of operations should be:

1. Remove all ACL from fo

Answer 1

Use SetAccessRuleProtection() to disable inheritance and remove inherited ACEs:

$acl.SetAccessRuleProtection($true, $false)

Use RemoveAccessRule() to remove existing (non-inherited) ACEs:

$acl.Access | ForEach-Object { $acl.RemoveAccessRule($_) | Out-Null }

Use AddAccessRule() to add new ACEs:

$ace = New-Object Security.AccessControl.FileSystemAccessRule "user", ...
$acl.AddAccessRule($ace)
...

Do this only for the topmost folder. Leave inheritance enabled everywhere below, so your changes are propagated automatically.