Makes it possible to run shell commands from a Node script. Tested on Mac and Windows. Inspired by https://gist.github.com/goatslacker/1050077

exec.js

#!/usr/bin/env node

const exec = require('child_process').exec
    , Promise = require('promise');

/**
 * @param {Array} array of shell commands
 */
module.exports = function(array){

    return new Promise(function(resolve, reject){

        if(!array || !array.length){
            return resolve();
        }

        let size = array.length,
            curr = 0;

        const next = function(cmd){

            exec(cmd, function(err, stdout, stderr){

                if(err){
                    console.error(err);
                }

                if(stdout){
                    console.log(stdout);
                }

                if(stderr){
                    console.log(stderr);
                }

                if(err){
                    return reject(err);
                }

                curr++;

                if(curr < size){
                    cmd = array.shift();
                    return next(cmd);
                }

                resolve();
            });
        };

        next(array.shift());
    });
};

// Example usage
// -------------
  
// const exec = require('./exec');

// let commands = [
//     'node -v',
//     'npm -v',
//     'echo "Hello World"'
// ];

// exec(commands)

//     .then(function(){
//         process.exit(0);
//     })

//     .catch(function(err){
//         process.exit(1);
//     });