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86 lines
3.3 KiB
Markdown
86 lines
3.3 KiB
Markdown
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# cross-spawn
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[![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]
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[npm-url]:https://npmjs.org/package/cross-spawn
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[downloads-image]:http://img.shields.io/npm/dm/cross-spawn.svg
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[npm-image]:http://img.shields.io/npm/v/cross-spawn.svg
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[travis-url]:https://travis-ci.org/IndigoUnited/node-cross-spawn
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[travis-image]:http://img.shields.io/travis/IndigoUnited/node-cross-spawn/master.svg
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[appveyor-url]:https://ci.appveyor.com/project/satazor/node-cross-spawn
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[appveyor-image]:https://img.shields.io/appveyor/ci/satazor/node-cross-spawn/master.svg
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[david-dm-url]:https://david-dm.org/IndigoUnited/node-cross-spawn
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[david-dm-image]:https://img.shields.io/david/IndigoUnited/node-cross-spawn.svg
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[david-dm-dev-url]:https://david-dm.org/IndigoUnited/node-cross-spawn#info=devDependencies
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[david-dm-dev-image]:https://img.shields.io/david/dev/IndigoUnited/node-cross-spawn.svg
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A cross platform solution to node's spawn and spawnSync.
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## Installation
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`$ npm install cross-spawn`
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If you are using `spawnSync` on node 0.10 or older, you will also need to install `spawn-sync`:
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`$ npm install spawn-sync`
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## Why
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Node has issues when using spawn on Windows:
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- It ignores [PATHEXT](https://github.com/joyent/node/issues/2318)
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- It does not support [shebangs](http://pt.wikipedia.org/wiki/Shebang)
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- No `options.shell` support on node < v6
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- It does not allow you to run `del` or `dir`
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All these issues are handled correctly by `cross-spawn`.
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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.
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## Usage
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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.
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```js
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var spawn = require('cross-spawn');
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// Spawn NPM asynchronously
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var child = spawn('npm', ['list', '-g', '-depth', '0'], { stdio: 'inherit' });
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// Spawn NPM synchronously
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var results = spawn.sync('npm', ['list', '-g', '-depth', '0'], { stdio: 'inherit' });
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```
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## Caveats
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#### `options.shell` as an alternative to `cross-spawn`
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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:
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- It's not supported in node < v6
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- It has no support for shebangs on Windows
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- You must manually escape the command and arguments which is very error prone, specially when passing user input
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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.
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#### Shebangs
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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`.
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Remember to always test your code on Windows!
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## Tests
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`$ npm test`
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## License
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Released under the [MIT License](http://www.opensource.org/licenses/mit-license.php).
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