!7

p {
  S options = "-f 140/171"; // audio only
  
  File youtubeDL = installYouTubeDL();
  S url = or2(first(args), "https://www.youtube.com/watch?v=99Q31nyH16w");
  File outputFile = prepareProgramFile("youtube-dl.out");
  S outputTemplate = f2s(new File(programDir(), "%(title)s-%(id)s.%(ext)s"));
  makeEmptyFile(outputFile);
  tailFile(outputFile, 1000, voidfunc(S s) { printNoNewLine(fixNewLines(s)) });
  // make a dependent child process that is exited when we exit
  backtick_verbose = true;
  backtickToFile_dependent(print(bashQuote(youtubeDL) + options + " -o " + bashQuote(outputTemplate) + " " + bashQuote(url)), outputFile);
}