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Catch error from calling another program

Catch error from calling another program


I'm a complete newbie to powershell.  I'm trying to catch the output of the command that I'm calling, which is pscp binary.  I would like to check for errors returned when the binary is executed. Depending on the error I would like to trigger an event, like attempt to re-transfer the file(s) that returned the error or just run through all the files again. Right now if I print $status it appears to be blank/null.


$windowsLogPath = "C:\files\uploads"
$unixLogPath = "/var/www/uploads"
$privKey = "c:\keys\key"
$pscp = "C:\pscp.exe -r -scp -i " + $privKey    
$user = "uploader"
$remoteServer = "xx.xx.xx.xx"

function run-SCP
        $runCommandConstr = $pscp + " " + $windowsLogPath+ "/*" + " " + $user+"@"+ $remoteServer + ":" + $unixLogPath    
        Invoke-Expression $runCommandConstr    
          "caught a system exception"

$status = run-SCP

if ($status -eq "True")
    "Copy completed successfully"
    "Copy failed, will attempt to run the command again"    
    $retry = run-SCP
    if ( $retry -eq "True")
        "Second attempt successful
        "Failed, aborting"

I also tried just capturing the exit status like below, then checking for that.  But it's not an accurate result b/c it will return true even if the transfer wasn't successful.  


Invoke-Expression $runCommandConstr
$status = $?

My question is how do I actually capture if any of the transfers failed or if there was a problem either due to permissions or access denied or timeout etc... All of which are reported when the command "$runCommandConstr" is executed. I just need to be able to capture that output and add some error logic to what is returned.

Thanks for the help in advanced.

RE: Catch error from calling another program

What does $error contain?

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