Conditional Processing in Automation

Particularly for complex conditions or conditions involving remote files, using WinSCP .NET assembly is the easiest and the recommended approach.

An example of PowerShell script that checks if a remote file exists before downloading it:

$remotePath = "/home/user/test.txt"
$localPath = "C:\download\test.txt"
 
if ($session.FileExists($remotePath))
{
    Write-Host ("File {0} exists, downloading" -f $remotePath)
    $session.GetFiles($remotePath, $localPath).Check()
}
else
{
    Write-Host ("File {0} does not exist" -f $remotePath)
}

See also:

• Checking file existence;
• Using WinSCP .NET assembly from PowerShell;
• Example for Session.FileExists (complete code for above example);
• Example for Session.GetFiles (showing how to test a local file existence and how to compare local and remote file timetamps).

If you do not want to use .NET assembly, for simple conditions or conditions involving local files, you may be able to move the condition outside of WinSCP script into a wrapper batch file.

For example you can use an if command to test a local file existence before uploading it:

if exist c:\upload\test.txt winscp.com /script=upload.txt

See also:

• Checking file existence;
• Checking script results;
• Advanced FTP/SFTP scripting;
• Interpreting XML log for advanced scripting.