Robocopy From powershell

RoboCopyWithErrorChecking.ps1

function InvokeRoboCopyCommandWithErrorChecking ($command, $errorMessage) {
	$global:LASTEXITCODE = 0

	[int[]]$errorCodes = @(8,16)
	#Write-Host $command
    Invoke-Expression $command -ErrorAction Stop

	$roboCopyExitCode = $global:LASTEXITCODE;

	# Below is taken from http://stackoverflow.com/questions/21428632/powershell-bitwise-comparison-for-robocopy-exit-codes

	$returnCodeMessage = @{
		0x00 = "[ROBOCOPY - INFO]: No errors occurred, and no copying was done. The source and destination directory trees are completely synchronized."
		0x01 = "[ROBOCOPY - INFO]: One or more files were copied successfully (that is, new files have arrived)."
		0x02 = "[ROBOCOPY - INFO]: Some Extra files or directories were detected. Examine the output log for details."
		0x04 = "[ROBOCOPY - WARN]: Some Mismatched files or directories were detected. Examine the output log. Some housekeeping may be needed."
		0x08 = "[ROBOCOPY - ERROR]: Some files or directories could not be copied (copy errors occurred and the retry limit was exceeded). Check these errors further."
		0x10 = "[ROBOCOPY - ERROR]: Usage error or an error due to insufficient access privileges on the source or destination directories."
	}

	Write-Host $( @( $returnCodeMessage.Keys | Where-Object { $_ -band $roboCopyExitCode } | ForEach-Object {return $returnCodeMessage[$_]}   ) -join "`r`n");

	$global:LASTEXITCODE = ($roboCopyExitCode -ge 8); # Change it to something other systems will understand

    if ($PSVersionTable.PSVersion.Major -ge 3) {
	    if ($errorCodes.Contains($roboCopyExitCode)) {
            throw $errorMessage
        } 
    }
    else {
        $errorCodes | foreach { 
            if ($_ -eq $roboCopyExitCode) {
                throw $errorMessage
            }
        }
    }
}