$path = "C:\test"
$name = [System.Security.Principal.WindowsIdentity]::GetCurrent().Name
$acl = Get-Acl "C:\test"
$accessRule = New-Object System.Security.AccessControl.FileSystemAccessRule($name,"FullControl","Allow")
$acl.SetAccessRule($accessRule)
$acl | Set-Acl "C:\test"
Get-ChildItem -Path "$path" -Recurse -Force | Set-Acl -aclObject $acl -Verbose