Need to recursivley get folder name and append to files

 As I process folders I want to capture the folder name and append to each file I process in that perticular folder.

 THis is a script I have that appends a file name to the end. I want the folder that it's currently processing added to the end of
each file.

 The folder structure example I'm using is

C:\sistemi  -- Need to recursivley get next to folders and pull Folder name in example.

$path='C:\Sistemi\'
get-childitem -path $path *.spx | % {" Starting File Process....."  >> $path\sistem.log
	   $PDate = get-date
       $date = get-date -uformat "_%d_%m_%Y_%H%M%S.bak"
       #"Set backup date to $date" >> $path\sistem.log
       $newname=($_.fullname -replace ".spx",$date)
	$file = [System.IO.Path]::GetFileNameWithoutExtension($_.fullname)"File backup name is $newname" >> $path\sistem.log 
       Rename-Item $_.fullname $newname"Renamed file to $newname" >> $path\sistem.log
	   $lines = get-content $newname
	   foreach ($line in $lines) 
	    {
			$line + " " + [System.IO.Path]::GetFileNameWithoutExtension($_.fullname) | Out-File "$path\sistem.csv"   -append
	    }		
       Write-Host $_.fullname "Files Processed on $PDate are $newname " >> $path\sistem.log
}

C:\Sistemi\REW1___1
C:\Sistemi\REW2___1 

I need to pull up to the underscore as the folder name (REW1,REW2 examples) and append that to the end of each processed file in my script.