static S backtickInSuperUserVM(S cmd, bool uninterruptible default false) {
  if (isRoot()) {
    temp tempSetTL(backtick_uninterruptable, uninterruptible);
    ret backtickToConsole_returnOutput(cmd);
  }
    
  //S s = sendToSuperUserVM("please run program * with arguments *", #1009066, ll(cmd));
  S s = sendToSuperUserVM2(uninterruptible ? "backtick uninterruptible *" : "backtick *", cmd);
  assertTrue(startsWith(s, "OK "));
  ret unquote(substring(s, 3));
}