Multithreaded file copy like robocopy (But not)

PowerShell Help
1

Hey all, I am new to the forum. I have been writing PowerShell scripts for a couple of years now and am expanding my knowledge. Recently, I found myself needing to copy files from a database server to a file share for backup purposes. I wrote a function that copies the file, then verifies the hash value of the copy to the source. It used to delete the original, but I removed that part of it. What I want to do is to run the foreach loop in parallel to expedite the completion of the code.

Feel free to contribute on my github (https://github.com/scriptingcaveman/Move-EBFile).

Try{
    Get-ChildItem -Path $SourcePath -Recurse | ForEach-Object {
        Write-Verbose -Message 'Replacing source path with destination path'
        $DestinationFile = $_.FullName -replace [regex]::Escape($SourcePath),$DestinationPath
        $SourceFile = $_.FullName
        Try {
            Copy-Item -Path $SourceFile -Destination $DestinationFile
        } Catch {
            Write-Error -Message "File Copy not able to be completed."
        }
        IF((Get-Childitem -Path $DestinationFile).Name -eq (Split-Path -Path $SourceFile -Leaf)){
            Try {
                $FileHashTable = $null
                $FileHashTable = [Ordered]@{"SourceFile" = $SourceFile;
                    "SourceHash"                    = (Get-FileHash -Path $SourceFile -Algorithm MD5).Hash;
                    "DestinationFile"               = $DestinationFile;
                    "DestinationHash"               = (Get-FileHash -Path $DestinationFile -Algorithm MD5).Hash
                }
                IF ($FileHashTable.SourceHash -ne $FileHashTable.DestinationHash) {
                    $FIlehashTable.Add("Result", $false)
                }
                Else {
                    $FilehashTable.Add("Result", $true)
                }
            } Catch{
                Write-Error -Message "File Hash not able to be completed."
             }
         }
         IF($FileHashTable.Result){
             Write-Verbose "File copy completed and hash matches the source."
             Write-Output  $FileHashTable
         } Else {
             Write-Verbose "File copy hash does not match the source."
             Write-Output $FileHashTable
         }
    }
} Catch {
    Write-Verbose -Message 'Copy item script issue.'
}
}
2

There is a foreach parallel as part of workflows or you can use a scriptblock. See below:

https://stackoverflow.com/questions/52137980/copying-multiple-files-in-parallel-through-power-shell-without-using-any-third-p

3

There’s a foreach-object -parallel in powershell 7 too with -throttlelimit. PowerShell ForEach-Object Parallel Feature - PowerShell Team

4

Thank you both. That’s exactly what I needed.

5

There’s start-job too, which starts a new process.