// What command was this VM launched with?
static S getVMCommand() {
  if (isWindows()) fail("Windows!");
  
  S bla = backtick("ps -u -p " + getProcessID());
  L<S> lines = toLines(bla);
  S header = lines.get(0);
  S body = lines.get(1);
  int idx = header.indexOf("COMMAND");
  ret body.substring(idx).trim();
}