How to get the Parent's parent directory in Powershell?
Version for a directory
get-item is your friendly helping hand here.
(get-item $scriptPath ).parent.parent
If you Want the string only
(get-item $scriptPath ).parent.parent.FullName
Version for a file
If $scriptPath points to a file then you have to call Directory property on it first, so the call would look like this
(get-item $scriptPath).Directory.Parent.Parent.FullName
Remarks
This will only work if $scriptPath exists. Otherwise you have to use Split-Path cmdlet.
I've solved that like this:
$RootPath = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent