I have a script here that SFTP's files from one location to another, the script works fine however I'd like to change the script so that it only copies files that are not already present. Bit of a noob with powershell so any help would be greatly appreciated.

cd "c:\Program Files (x86)\WinSCP\" # location of .NET assembly ddl file

    # Load WinSCP .NET assembly
    Add-Type -Path "WinSCPnet.dll"

    # Setup session options
    $sessionOptions = New-Object WinSCP.SessionOptions
    $sessionOptions.Protocol = [WinSCP.Protocol]::Sftp
    $sessionOptions.HostName = "192.168.xxx.xxx"
    $sessionOptions.UserName = "xxxx"
    $sessionOptions.Password = "xxxx"
    $sessionOptions.SshHostKeyFingerprint = "ssh-rsa 2048 xx:xx:xx"

    $session = New-Object WinSCP.Session

        # Connect

        $stamp = Get-Date -f "yyyyMMdd"
        $fileName = "export_$stamp.txt"
        $remotePath = "/home/user/john/reports"
        $localPath = "\\fileserver\reports\"

        if ($session.FileExists($remotePath))
            if (!(Test-Path $localPath))
                Write-Host (
                    "File {0} exists, local backup {1} does not" -f
                    $remotePath, $localPath)
                $download = $True

            if ($download)
                # Download the file and throw on any error
                $session.GetFiles($remotePath, $localPath).Check()

                Write-Host "Download to backup done."
            Write-Host ("File {0} does not exist yet" -f $remotePath)
        # Disconnect, clean up

    exit 0
catch [Exception]
    Write-Host $_.Exception.Message
    exit 1

Many Thanks.

  • Your code already does what you ask for. That's what the if (!(Test-Path $localPath)) branch is there for. Do you have some problem with that? Or do you want to change the script to allow transferring more files, not just one? – Martin Prikryl Sep 3 '14 at 13:10
  • The script above will overwrite all files in the destination directory – user3329963 Sep 3 '14 at 15:00
  • OK, I didn't notice you tried to synchronize directories, not files. See my answer. – Martin Prikryl Sep 3 '14 at 19:20

The script your took from WinSCP example for the Session.GetFiles was designed for a single file only. You have tried to bend it to synchronize directories instead. That cannot work.

To synchronize directories, use the Session.SynchronizeDirectories:

# Synchronize files
$synchronizationResult = $session.SynchronizeDirectories(
    [WinSCP.SynchronizationMode]::Local, $localPath $remotePath)

# Throw on any error
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