Powershell to get folder size with Get-ChildItem

Here's my script of the day. I wanted to write a Powershell script which could retrieve the files and folders size for a specified list of volumes. It was important for me to include also empty directories and zero size files, which is not so easy to get with the standard 'Get-ChildItem' method.

The script will return for each volume:

• the name of the subfolder
• the total size of the subfolder
• the number of files in the subfolder (including zero size files)
• the average file size

Here's the code.

I haven't had the time to optimize it, but it does work and does what it says it does.

Feel free to use it if you need it and to leave a comment if you want to suggest an improvement or a correction.

1. clear-host  
2. $volumes = "c:\","e:\","f:\","x:\" 
3. foreach ($startFolder in $volumes){ 
4. $colItems = (Get-ChildItem $startFolder | Where-Object {$_.PSIsContainer -eq $True} | Sort-Object) 
5. foreach ($i in $colItems) 
6.     { 
7.         $subFolderItems = (Get-ChildItem $i.FullName -Recurse | Measure-Object -property length -sum) 
8.         $count = @((Get-ChildItem $i.FullName -force -recurse  | where {$_.length -ge 0} )).Count 
9.         if($count -eq 0)  
10.             { 
11.             if($subFolderItems.sum -lt 1) 
12.                 { 
13.                 $avgsize = 0 
14.                 $totalsize = 0 
15.                 } 
16.             else 
17.                 { 
18.                 $avgsize = "Not possible" 
19.                 $totalsize = "Not possible" 
20.                 } 
21.             } 
22.         else 
23.             { 
24.             $avgsize = [math]::round($subFolderItems.sum/$count / 1MB,2) 
25.             $totalsize = [math]::round($subFolderItems.sum / 1MB,2) 
26.             } 
27.         $output_final = $startFolder + ",",$i.FullName + ",",$totalsize + " MB,",$count + ",",$avgsize + " MB"  
28.         $output_final | Out-File -Append 'folder-size-log.csv' -Encoding ASCII  
29.     }  
30. }