static void logOutput2() {
  File _logFile = null;
  while licensed {
    _logFile = getProgramFile(ymd() + "-" + hms() + ".txt");
    if (_logFile.exists()) sleep(50); else break;
  }
  final File logFile = _logFile;
  
  set(getJavaX(), "customSystemOut", new Appendable() {
    // only using this one
    public Appendable append(CharSequence cs) {
      appendToTextFile(logFile, cs.toString());
      return this;
    }

    public Appendable append(char c) { return this; }
    public Appendable append(CharSequence s, int start, int end) { return this; }
  });
}

Began life as a copy of #1002226