Counting subfolders of a folder

Question

I am trying to delete ASP .NET temporary files creating a PowerShell script. Until now, I managed to find under C:\Windows\Microsoft .NET\Temporary .NET Files files (not folders) older than 60 days and delete them. But my problem now is that under C:\Windows\Microsoft .NET\Temporary .NET Files there is a folder named root. This folder has only one subfolder. What I want is

• Count how many subfolders exist under root folder.
• If there is only one folder, do not do anything.
• If there are more than one, leaves the most recent folder and delete the others.

How could this be done with PowerShell?

Answer 1

Recurse into that root folder, filter the results for directories (items for which the PSIsContainer property is $true), and count the results:

Get-ChildItem 'C:\path\to\root' -Recurse |
  ? { $_.PSIsContainer } |
  Measure-Object |
  select -Expand Count

If you have PowerShell v3 or newer you can simplify that by calling Get-ChildItem with the parameter -Directory:

Get-ChildItem 'C:\path\to\root' -Recurse -Directory |
  Measure-Object |
  select -Expand Count