import 'dart:io';
import 'dart:convert';

main() async {
  var process = await Process.start('cat', []);
  process.stdout
      .transform(utf8.decoder)
      .forEach(print);
}

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你可以在这里阅读更多：https://api.flutter.dev/flutter/dart-io/Process-class.html

在阅读Process文档时，我得出了以下结论：

import 'dart:io';
import 'dart:convert';

main() async {
  final process = await Process.start('ls', ['-l']);

  final List<String> standardOutputLines = [];

  await process.stdout
      .transform(utf8.decoder)
      .forEach(standardOutputLines.add);

  final standardOutput = standardOutputLines.join('\n');
  print(standardOutput);
}

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