tests/standalone/io/process_std_io_script.dart

// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
//
// Utility script to echo stdin to stdout or stderr or both.

import "dart:io";

main() {
  var options = new Options();
  if (options.arguments.length > 0) {
    if (options.arguments[0] == "0") {
      stdin.pipe(stdout);
    } else if (options.arguments[0] == "1") {
      stdin.pipe(stderr);
    } else if (options.arguments[0] == "2") {
      stdin.listen((data) {
        stdout.writeBytes(data);
        stderr.writeBytes(data);
      });
    }
  }
}