/** possibly improvable */
sS safeBashQuote(String text) {
  if (text == null) return null;
  return "'" + text
    .replace("\\", "\\\\")
    .replace("'", "\\'")
    .replace("\n", "\\n")
    .replace("\r", "\\r") + "'";
}

sS safeBashQuote(File f) {
  ret safeBashQuote(f.getAbsolutePath());
}