protected function addCommandPart($part)
{
$this->command .= ' ';
if ($this->commandLineLength > 0 && $this->currentLineLength + strlen($part) > $this->commandLineLength) {
$this->currentLineLength = 0;
$this->command .= "\\\n ";
}
$this->command .= $part;
$this->currentLineLength += strlen($part) + 2;
}