Delete X files in each folders and sub folders - powershell

Question

I want to delete files in a folder and its subfolders but not X last files again in each folder. For example in C:\Test I want to keep 10 txt files but also in C:\Test\subtest1 and C:\Test\subtest2. Here, X X is the number of files I want to keep.
But it will not keep 10 files in each folder but in the entire arborescence.
My script is not fully functional, but it did it well in the C:\Test directory:
Set-ExecutionPolicy unrestricted $txtfiles = 'C:\Users\MUC8VX\Documents\Test
ForEach-Object { Get-ChildItem $txtfiles | where{ -not $_.PsIsContainer}|
sort LastWriteTime -desc| select -Skip 10 |
Remove-Item -Include *.txt* -Force }
And if I add -Recurse it will not keep 10 files in each folders but in the entire arborescence:
Set-ExecutionPolicy unrestricted
$txtfiles =`C:\Users\MUC8VX\Documents\Test'
ForEach-Object { Get-ChildItem $txtfiles -Recurse | where{ -not
$_.PsIsContainer}| sort LastWriteTime -desc|
select -Skip 10 | Remove-Item -Include *.txt* -Force }
edit :
Thanks a lot Manuel Batsching.
Here's a generic script :
#Insert your parent folder which contains files and subfolders
Get-Childitem -Path C:\Your\Parent\Folder -Recurse |
Group-Object Directory |
ForEach-Object {
$_.Group |
#sort by the last written files
Sort-Object LastWriteTime -Descending |
#Keep the X last files you want to keep
Select-Object -Skip X |
#Remove files according to their extension
Remove-Item -Include *.extension* -Force }

Answer 1

I haven't tested but you can try this.
Set-ExecutionPolicy unrestricted
$txtfiles = 'C:\Users\MUC8VX\Documents\Test'
Get-ChildItem -Directory -Recurse -Path $txtfiles | ForEach-Object {
Get-ChildItem -Path $_.fullname -Include *.txt | Sort-Object LastWriteTime -Descending | Select-Object -Skip 10 | Remove-Item -Force
}
Basically, this code iterate over each folder recursively, for each folder, it find the files, skip 10 and remove all others.

Answer 2

If you are looking for a solution, that also applies to nested subfolders, you can list all files recursively and then group them by the path of their respective parent folder. Then apply your sorting rules and reduce each group to 10 elements.
Get-Childitem *.txt -Recurse |
Group-Object Directory |
ForEach-Object {
$_.Group |
Sort-Object LastWriteTime -Descending |
Select-Object -Skip 10 |
Remove-Item }