http://stackoverflow.com/q/31738975/2476755

promises.js

import Promise from 'bluebird'

let fs = Promise.promisifyAll(require('fs'))
let exec = Promise.promisify(require('child_process').exec)

function mapCommands (file) {
    return file.split('\n').reduce((p, c) => {
        let separation = c.indexOf(':')
        p[c.slice(3, separation)] = c.slice(separation + 2)
        return p
    }, {})    
}

function execCommands (obj) {
    let commands = []
    for (let key in obj) {
        let cmd = exec(obj[key])
        commands.push(cmd)
    }
    return Promise.all(commands)
}

export default {
    createNew () {
        fs.readFileAsync('C://test.txt', 'utf8')
        .then(mapCommands)
        .then(execCommands)
        .then(() => {
            // success; all commands executed
        }).catch((err) => {
            console.log(err)    // handle err
        }) 
    }
}