{"maintainers":[{"name":"sindresorhus","email":"sindresorhus@gmail.com"}],"keywords":["exec","child","process","execute","fork","execfile","spawn","file","shell","bin","binary","binaries","npm","path","local"],"dist-tags":{"latest":"0.6.3"},"author":{"name":"Sindre Sorhus","email":"sindresorhus@gmail.com","url":"sindresorhus.com"},"description":"A better `child_process`","readme":"# execa [](https://travis-ci.org/sindresorhus/execa) [](https://ci.appveyor.com/project/sindresorhus/execa/branch/master) [](https://coveralls.io/github/sindresorhus/execa?branch=master)\n\n> A better [`child_process`](https://nodejs.org/api/child_process.html)\n\n\n## Why\n\n- Promise interface.\n- [Strips EOF](https://github.com/sindresorhus/strip-eof) from the output so you don't have to `stdout.trim()`.\n- Supports [shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) binaries cross-platform.\n- [Improved Windows support.](https://github.com/IndigoUnited/node-cross-spawn#why)\n- Higher max buffer. 10 MB instead of 200 KB.\n- [Executes locally installed binaries by name.](#preferlocal)\n- [Cleans up spawned processes when the parent process dies.](#cleanup)\n\n\n## Install\n\n```\n$ npm install --save execa\n```\n\n\n## Usage\n\n```js\nconst execa = require('execa');\n\nexeca('echo', ['unicorns']).then(result => {\n\tconsole.log(result.stdout);\n\t//=> 'unicorns'\n});\n\n// pipe the child process stdout to the current stdout\nexeca('echo', ['unicorns']).stdout.pipe(process.stdout);\n\nexeca.shell('echo unicorns').then(result => {\n\tconsole.log(result.stdout);\n\t//=> 'unicorns'\n});\n\n// example of catching an error\nexeca.shell('exit 3').catch(error => {\n\tconsole.log(error);\n\t/*\n\t{\n\t\tmessage: 'Command failed: /bin/sh -c exit 3'\n\t\tkilled: false,\n\t\tcode: 3,\n\t\tsignal: null,\n\t\tcmd: '/bin/sh -c exit 3',\n\t\tstdout: '',\n\t\tstderr: '',\n\t\ttimedOut: false\n\t}\n\t*/\n});\n```\n\n\n## API\n\n### execa(file, [arguments], [options])\n\nExecute a file.\n\nSame options as [`child_process.spawn`](https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options).\n\nThink of this as a mix of `child_process.execFile` and `child_process.spawn`.\n\nReturns a [`child_process` instance](https://nodejs.org/api/child_process.html#child_process_class_childprocess), which is enhanced to also be a `Promise` for a result `Object` with `stdout` and `stderr` properties.\n\n### execa.stdout(file, [arguments], [options])\n\nSame as `execa()`, but returns only `stdout`.\n\n### execa.stderr(file, [arguments], [options])\n\nSame as `execa()`, but returns only `stderr`.\n\n### execa.shell(command, [options])\n\nExecute a command through the system shell. Prefer `execa()` whenever possible, as it's both faster and safer.\n\nSame options as [`child_process.spawn`](https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options).\n\nReturns a [`child_process` instance](https://nodejs.org/api/child_process.html#child_process_class_childprocess).\n\nThe `child_process` instance is enhanced to also be promise for a result object with `stdout` and `stderr` properties.\n\n### execa.sync(file, [arguments], [options])\n\nExecute a file synchronously.\n\nSame options as [`child_process.spawnSync`](https://nodejs.org/api/child_process.html#child_process_child_process_spawnsync_command_args_options), except the default encoding is `utf8` instead of `buffer`.\n\nReturns the same result object as [`child_process.spawnSync`](https://nodejs.org/api/child_process.html#child_process_child_process_spawnsync_command_args_options).\n\nThis method throws an `Error` if the command fails.\n\n### execa.shellSync(file, [options])\n\nExecute a command synchronously through the system shell.\n\nSame options as [`child_process.spawnSync`](https://nodejs.org/api/child_process.html#child_process_child_process_spawnsync_command_args_options), except the default encoding is `utf8` instead of `buffer`.\n\nReturns the same result object as [`child_process.spawnSync`](https://nodejs.org/api/child_process.html#child_process_child_process_spawnsync_command_args_options).\n\n### options\n\nAdditional options:\n\n#### stripEof\n\nType: `boolean`
\nDefault: `true`\n\n[Strip EOF](https://github.com/sindresorhus/strip-eof) (last newline) from the output.\n\n#### preferLocal\n\nType: `boolean`
\nDefault: `true`\n\nPrefer locally installed binaries when looking for a binary to execute.
\nIf you `$ npm install foo`, you can then `execa('foo')`.\n\n#### input\n\nType: `string` `Buffer` `ReadableStream`\n\nWrite some input to the `stdin` of your binary.
\nStreams are not allowed when using the synchronous methods.\n\n#### reject\n\nType: `boolean`
\nDefault: `true`\n\nSetting this to `false` resolves the promise with the error instead of rejecting it.\n\n#### cleanup\n\nType: `boolean`
\nDefault: `true`\n\nKeep track of the spawned process and `kill` it when the parent process exits.\n\n\n## Tips\n\n### Save and pipe output from a child process\n\nLet's say you want to show the output of a child process in real-time while also saving it to a variable.\n\n```js\nconst execa = require('execa');\nconst getStream = require('get-stream');\n\nconst stream = execa('echo', ['foo']).stdout;\n\nstream.pipe(process.stdout);\n\ngetStream(stream).then(value => {\n\tconsole.log('child output:', value);\n});\n```\n\n\n## License\n\nMIT © [Sindre Sorhus](https://sindresorhus.com)\n","repository":{"type":"git","url":"git+https://github.com/sindresorhus/execa.git"},"users":{"timdp":true,"king.v":true,"abhisekp":true,"arttse":true,"antixrist":true,"danielbayley":true,"chocolateboy":true,"bobxuyang":true,"huhgawz":true,"jamescostian":true,"santi8ago8":true,"daizch":true,"fengmiaosen":true,"shuoshubao":true,"serge-nikitin":true},"bugs":{"url":"https://github.com/sindresorhus/execa/issues"},"license":"MIT","versions":{"0.1.0":{"name":"execa","version":"0.1.0","description":"A better child_process.{execFile,exec}","license":"MIT","repository":{"type":"git","url":"https://github.com/sindresorhus/execa"},"author":{"name":"Sindre Sorhus","email":"sindresorhus@gmail.com","url":"sindresorhus.com"},"engines":{"node":">=0.12"},"scripts":{"test":"xo && 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