Avoiding File Duplication before Copying files to the folder and Subfolder - powershell

Question

I am trying to create a code on Powershell that will actually Copy files from one Location( Lets say A) to location B. Now Location B have two subfolders (lets say X and Y). I need to copy the file from A to B but before copying I need to make sure that the files which I am copying should not be there in X or Y in order to avoid file duplication. If the file exist, it should not copy that particular file.
$PathS = Get-ChildItem -Path "\\sc-y-ap-swt-1\AutoClientFiles\reception\*.txt" |
Where-Object { $_.CreationTime -gt (Get-Date).AddDays(-1) }
$PathD = "C:\OCM\data\EverestSwift\inbound\"
$pathtest = Get-ChildItem -path "C:\OCM\data\EverestSwift\inbound\" -Recurse -File
If((Test-Path -Path "\\sc-y-ap-swt-1\AutoClientFiles\reception\*.txt") -eq $false) {
Exit
} Else {
Try {
Foreach ($File in $Pathtest){
if ($File -eq $PathS ){
Write-Host "Duplicate Files"
exit 1
}
Copy-Item -Path $PathS -Destination $PathD -Force
Exit 0
}
} catch [Exception]{
Write-Host $_.Exception.Message
Exit 1
}
}

Answer 1

You can do this, but why. As Cory said, this is why robocopy exists.
What do you mean by same?
The filename can be the same, but the timestamps can be different, thus making it a different file, even if the name is the same. So, you should be looking at name and timestamp or file hashes.
So, see these Q&A about such a use case.
Does Robocopy SKIP copying existing files by default?
How to skip existing and/or same size files when using robocopy
RoboCopy "%%F" %destination% *.srt *.pdf *.mp4 *.jpg /COPYALL /XO /R:0
Yet, doing this with powerShell, your post could be a duplicate of this one.
Copy items from Source to Destination if they don't already exist
Examples from the above:
$Source = 'C:\SourceFolder'
$Destination = 'C:\DestinationFolder'
Get-ChildItem $Source -Recurse | ForEach {
$ModifiedDestination = $($_.FullName).Replace("$Source","$Destination")
If ((Test-Path $ModifiedDestination) -eq $False) {
Copy-Item $_.FullName $ModifiedDestination
}
}
# Or
$Source = '<your path here>'
$Dest = '<your path here>'
$Exclude = Get-ChildItem -recurse $Dest
Get-ChildItem $Source -Recurse -Filter '*' |
Copy-Item -Destination $Dest -Verbose -Exclude $Exclude