Moving multiple files to matching name ones in another disk in PowerShell - windows

Question

I was downloading a huge torrent (1.2tb with over 6000 folders) divided in 2 parts, so I placed the 2nd part on the designed place and it was not a problem since the master-folder of the torrent is exactly what was needed. The 1st part master-folder was named with some generic torrent name instead of the name I needed, so instead of renaming the torrent name to "source", which I think would have worked and renamed the currently generic name to "source". In files tab I selected all the files and right-click>relocate all of them and bittorrent simply moved all of the files to the same directory, without any subfolder, and created a mess.
So I have a un-finished backup of this torrent and the files are in place, so my idea was using the un-finished one's name, match with the finished ones and put the finished ones in the un-finished matching name's path folder. I hope that was clear.
I tried to resolve this using PowerShell, but I dont know much, so I came up with this and nothing happens, something is wrong. Anyone knows a solution?
$itemlistA = Get-ChildItem -Path "D:\BitTorrent\" |
ForEach-Object {
$objnameA = $_.Name
$objPathA = $_.FullName
}
$itemlistB = Get-ChildItem -Path "E:\DesiredPath\" -recurse |
ForEach-Object{
$objnameB = $_.Name
$objPathB = $_.FullName
}
ForEach-Object{
if($objnameA -eq $objnameB){
Copy-Item -path $objPathA -Destination $objPathB
Write-Host "ffff Object ($objnameA) new Path ($objPathB) ffff"
}
}

Answer 1

If I'm understanding your intent correctly, the script below will accomplish your goal, assuming your goal is to copy files from a flattened directory into some (potentially) nested directories so that the incoming files overwrite files with matching names.
The O(n^2) performance of the nested loops could be improved with a sort and more efficient search.
You'd need to edit the script's params to reflect your own environment.
param(
$pathToFiles = "$PSScriptRoot\BitTorrent\",
$desiredPath = "$PSScriptRoot\DesiredPath\"
)
$itemlistA = Get-ChildItem -Path $pathToFiles | Select-Object -Property Name, FullName
$itemlistB = Get-ChildItem -Path $desiredPath -Recurse | Select-Object -Property Name, FullName
foreach ($fileA in $itemlistA) {
foreach ($fileB in $itemListB) {
if ($fileB.Name -eq $fileA.Name) {
Copy-Item -path $fileA.FullName -Destination $fileB.FullName -Verbose
break
}
}
}