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# cross-spawn [![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Build status][appveyor-image]][appveyor-url] [![Dependency status][david-dm-image]][david-dm-url] [![Dev Dependency status][david-dm-dev-image]][david-dm-dev-url] [npm-url]:https://npmjs.org/package/cross-spawn [downloads-image]:http://img.shields.io/npm/dm/cross-spawn.svg [npm-image]:http://img.shields.io/npm/v/cross-spawn.svg [travis-url]:https://travis-ci.org/IndigoUnited/node-cross-spawn [travis-image]:http://img.shields.io/travis/IndigoUnited/node-cross-spawn/master.svg [appveyor-url]:https://ci.appveyor.com/project/satazor/node-cross-spawn [appveyor-image]:https://img.shields.io/appveyor/ci/satazor/node-cross-spawn/master.svg [david-dm-url]:https://david-dm.org/IndigoUnited/node-cross-spawn [david-dm-image]:https://img.shields.io/david/IndigoUnited/node-cross-spawn.svg [david-dm-dev-url]:https://david-dm.org/IndigoUnited/node-cross-spawn#info=devDependencies [david-dm-dev-image]:https://img.shields.io/david/dev/IndigoUnited/node-cross-spawn.svg A cross platform solution to node's spawn and spawnSync. ## Installation `$ npm install cross-spawn` If you are using `spawnSync` on node 0.10 or older, you will also need to install `spawn-sync`: `$ npm install spawn-sync` ## Why Node has issues when using spawn on Windows: - It ignores [PATHEXT](https://github.com/joyent/node/issues/2318) - It does not support [shebangs](http://pt.wikipedia.org/wiki/Shebang) - No `options.shell` support on node < v6 - It does not allow you to run `del` or `dir` All these issues are handled correctly by `cross-spawn`. There are some known modules, such as [win-spawn](https://github.com/ForbesLindesay/win-spawn), that try to solve this but they are either broken or provide faulty escaping of shell arguments. ## Usage Exactly the same way as node's [`spawn`](https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options) or [`spawnSync`](https://nodejs.org/api/child_process.html#child_process_child_process_spawnsync_command_args_options), so it's a drop in replacement. ```js var spawn = require('cross-spawn'); // Spawn NPM asynchronously var child = spawn('npm', ['list', '-g', '-depth', '0'], { stdio: 'inherit' }); // Spawn NPM synchronously var results = spawn.sync('npm', ['list', '-g', '-depth', '0'], { stdio: 'inherit' }); ``` ## Caveats #### `options.shell` as an alternative to `cross-spawn` Starting from node v6, `spawn` has a `shell` option that allows you run commands from within a shell. This new option solves most of the problems that `cross-spawn` attempts to solve, but: - It's not supported in node < v6 - It has no support for shebangs on Windows - You must manually escape the command and arguments which is very error prone, specially when passing user input If you are using the `shell` option to spawn a command in a cross platform way, consider using `cross-spawn` instead. You have been warned. #### Shebangs While `cross-spawn` handles shebangs on Windows, its support is limited: e.g.: it doesn't handle arguments after the path, e.g.: `#!/bin/bash -e`. Remember to always test your code on Windows! ## Tests `$ npm test` ## License Released under the [MIT License](http://www.opensource.org/licenses/mit-license.php).
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