Determine recursively both COUNT and SUM of all extensions in a folder - powershell

Question

I would like to be able to select a remote folder and scan it recursively for all file extensions. For each extension discovered, I would need a total count and well as the sum for individual file types.
I've found a script here that works for a single file extension using the -include switch, but rather than running the script scores of times, it would be nice to simply run once and collect all extensions.
$hostname=hostname
$directory = "D:\foo"
$FolderItems = Get-ChildItem $directory -recurse -Include *.txt
$Measurement = $FolderItems | Measure-Object -property length -sum
$colitems = $FolderItems | measure-Object -property length -sum
"$hostname;{0:N2}" -f ($colitems.sum / 1MB) + "MB;" + $Measurement.count + " files;"
I think I need to use Get-ChildItem $directory | Group-Object -Property Extension to somehow list the extensions, if that's helpful.
The ideal output would be something like this:
Extension, Size (MB), Count
jpg,1.72,203
txt,0.23,105
xlsx,156.12,456
I'm using Powershell v4.0 on a Windows 7 machine to remotely connect to the server, I could run the script locally, but it only has V3.0 for the Win 2008 R2 machine.
Does anyone have any ideas?

Answer 1

This is one approach:
#Get all items
Get-ChildItem -Path $directory -Recurse |
#Get only files
Where-Object { !$_.PSIsContainer } |
#Group by extension
Group-Object Extension |
#Get data
Select-Object #{n="Extension";e={$_.Name -replace '^\.'}}, #{n="Size (MB)";e={[math]::Round((($_.Group | Measure-Object Length -Sum).Sum / 1MB), 2)}}, Count
Extension Size (MB) Count
--------- --------- -----
mkv 164,03 1
xlsx 0,03 3
dll 0,32 5
lnk 0 1
url 0 1
txt 0 1