bash 2025.428.1728

Wrapper over `dart:io` [Process] API's that supports additional features.

bash

Wrapper over dart:io [Process] API's that supports features like environment management, user switches, and more.

Useful for writing shell utility scripts in Dart, or within applications that perform system administration tasks on behalf of other users.

import 'package:bash/bash.dart';
import 'package:file/local.dart';

main() async {
  var fs = const LocalFileSystem();
  var shell = Bash();

  // Pipe results to files, easily.
  var echo = await shell.start('echo hello world');
  await echo.stdout.writeToFile(fs.file('hello.txt'));
  await echo.stderr.drain();

  // You can run a program, and expect a certain exit code.
  //
  // If a valid exit code is returned, stderr is drained, and
  // you don't have to manually.
  //
  // Otherwise, a StateError is thrown.
  var find = await shell.start$(['find', '.', '-name', '"*.dart"']);
  await find.expectExitCode([0]); // Can also call find.expectZeroExit()

  // Dump outputs.
  print(await find.stdout.readAsString());

  // You can also run a process and immediately receive a string.
  var pwd = await shell.runAsString('pwd');
  print('cwd: `$pwd`');

  // Navigation allows you to `cd`.
  //shell.navigate('./lib/src');
  shell.navigate('./lib');
  shell.navigate('./src');
  pwd = await shell.runAsString$(['pwd']);
  print('cwd: `$pwd`');

  // You can use | within command line.
  String find2 = await shell.runAsString(
    'find . -name "*.dart" | wc -l',
    acceptedExitCodes: [0],
  );
  print(find2);

  // You can use | within command line.
  String find3 = await shell.runAsString$(
    ['find', '.', '-name', '"*.dart"', '|', 'wc', '-l'],
    acceptedExitCodes: [0],
  );
  print(find3);
}