<a name="exec"></a> ## exec(cmd, arg, opts) ⇒ <code>Promise.<{stdout: string, stderr: stderr}></code> Promisified child_process.exec **Kind**: global function | Param | Type | Description | | --- | --- | --- | | cmd | | | | arg | | | | opts | | See child_process.exec node docs | | opts.stdout | <code>stream.Writable</code> | If defined, child process stdout will be piped to it. | | opts.stderr | <code>stream.Writable</code> | If defined, child process stderr will be piped to it. |