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

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

You can split it at the backslashes, and take the next-to-last one with negative array indexing to get just the grandparent directory name.

($scriptpath -split '\\')[-2]

You have to double the backslash to escape it in the regex.

To get the entire path:

($path -split '\\')[0..(($path -split '\\').count -2)] -join '\'

And, looking at the parameters for split-path, it takes the path as pipeline input, so:

$rootpath = $scriptpath | split-path -parent | split-path -parent