# exec-sh

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> Execute shell command forwarding all stdio streams.

## Features

exec-sh is a wrapper for [`child_process.spawn`](http://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options) with some improvements:

* Cross platform command execution:
  * Windows: `cmd /C COMMAND`
  * others: `sh -c COMMAND`
* Fowrards all stdio streams to current terminal (by default):
  * `execSh("bash")`
  * `execsh("echo -n Say: && read i && echo Said:$i")`
* stdout and stderr are passed to callback when available
  * `execSh("pwd", console.log)`

## Showcase

```javascript
// JavaScript

execSh("echo hello exec-sh && bash", { cwd: "/home" }, function(err){
  if (err) {
    console.log("Exit code: ", err.code);
  }
});
```

```
# Terminal output: interactive bash session

hello exec-sh
bash-3.2$ pwd
/home
bash-3.2$ exit 99
exit
Exit code:  99
```

## Usage

```javascript
var execSh = require("../");

// run interactive bash shell
execSh("echo lorem && bash", { cwd: "/home" }, function(err){
  if (err) {
    console.log("Exit code: ", err.code);
    return;
  }

  // collect streams output
  var child = execSh(["bash -c id", "echo lorem >&2"], true,
    function(err, stdout, stderr){
      console.log("error: ", err);
      console.log("stdout: ", stdout);
      console.log("stderr: ", stderr);
    });
});
```

## Promise Interface

```javascript
var execShPromise = require("exec-sh").promise;

// run interactive bash shell
const run = async () => {
  let out;

  try {
    out = await execShPromise('pwd', true);
  } catch (e) {
    console.log('Error: ', e);
    console.log('Stderr: ', e.stderr);
    console.log('Stdout: ', e.stdout);

    return e;
  }

  console.log('out: ', out.stdout, out.stderr);
}

run();
```

## Public API

### `execSh(command, [options], [callback])`

Execute shell command forwarding all stdio.

**Parameters:**

* `command {String|Array}` - The command to run, or array of commands
* `[options] {Object|TRUE}` - Options object passed directly to [`child_process.spawn`](http://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options), when `TRUE` then `{ stdio: null }` used
* `[callback] {Function}` - `callback(err, stdout, stderr)`
* `err {Error|NULL}` - Error object. Has `code` property containing last command exit code when available
* `stdout {String|NULL}` - aggregated stdout or `NULL` if not available
* `stderr {String|NULL}` - aggregated stderr or `NULL` if not available

**Return Values:**

Returns [ChildProcess](http://nodejs.org/api/child_process.html#child_process_class_childprocess) object.

## Private API

Complete API Documentation including private and public methods is generated from source code by JSDoc tool and is [available here](https://s3.eu-central-1.amazonaws.com/tsertkov-artifacts/exec-sh/master/jsdoc/index.html).

## Code Coverage

Code coverage report for all files is [available here](https://s3.eu-central-1.amazonaws.com/tsertkov-artifacts/exec-sh/master/coverage/lcov-report/index.html).

## Scripts

* `npm test` - run tests
* `npm run jsdoc` - build jsdoc
* `npm run dev` - run tests continuously

## License

The MIT License (MIT)
