Create And Read Files

    main();
  
    function main() {
  
      var randomname = Number(new Date());
      // get the text file
      var filepath = "~/Desktop/" + randomname + ".txt";
      var write_file = File(filepath);
  
      if (!write_file.exists) {
        // if the file does not exist create one
        write_file = new File(filepath);
      } else {
        // if it exists ask the user if it should be overwritten
        var res = confirm("The file already exists. Should I overwrite it", true, "titleWINonly");
        // if the user hits no stop the script
        if (res !== true) {
          return;
        }
      }
  
      var out; // our output
      // we know already that the file exist
      // but to be sure
      if (write_file !== '') {
        //Open the file for writing.
        out = write_file.open('w', undefined, undefined);
        write_file.encoding = "UTF-8";
        write_file.lineFeed = "Unix"; //convert to UNIX lineFeed
        // txtFile.lineFeed = "Windows";
        // txtFile.lineFeed = "Macintosh";
      }
      // got an output?
      if (out !== false) {
        // loop the list and write each item to the file
        write_file.writeln("Hello World!");
        // always close files!
        write_file.close();
      }
  
      var read_file = File(filepath);
      read_file.open('r', undefined, undefined);
      if (read_file !== '') {
        alert("this is read only\n " + read_file.read());
        read_file.close();
      }
  
  
  
      var append_file = File(filepath);
      append_file.open('a', undefined, undefined);
      if (append_file !== '') {
        append_file.writeln("Hello I'm an appended line!");

      append_file.close();
    }

    var read_again_file = File(filepath);
    read_again_file.open('r', undefined, undefined);
    if (read_again_file !== '') {
      alert("this is read only again\n" + read_again_file.read());
      read_again_file.close();
    }

  }