Powershell 'cd' alias

cd-alias.ps1

# usage: . ./cd-alias.ps1
# cd ..
function CheckLastExitCode {
    param ([int[]]$SuccessCodes = @(0), [scriptblock]$CleanupScript=$null)

    if ($SuccessCodes -notcontains $LastExitCode) {
        $msg = "EXE RETURNED EXIT CODE $LastExitCode"
        throw $msg
    }
}

function Internal-Change-Directory {
    if(Test-Path "$args") {	
		Set-Location "$args";
		CheckLastExitCode
		ls;
	}
	else {
		Write-Output "$args is not a directory"
	}
}

Remove-Item alias:cd
New-Alias cd Internal-Change-Directory -Option AllScope