Node.js: writing shell scripts using modern JavaScript instead of Bash — https://medium.com/@vladimirtolstikov/774e0859f965

utils.js

/**
 * Executes shell command as it would happen in BASH script
 * @param {string} command
 * @param {Object} [options] Object with options. Set `capture` to TRUE, to capture and return stdout. 
 *                           Set `echo` to TRUE, to echo command passed.
 * @returns {Promise<{code: number, data: string | undefined, error: Object}>}
 */
module.exports.exec = function (command, {capture = false, echo = false} = {}) {
  command = command.replace(/\\?\n/g, ''); // need to merge multi-line commands into one string
  
  if (echo) {
    console.log(command);
  }
  
  const spawn = require('child_process').spawn;
  const childProcess = spawn('bash', ['-c', command], {stdio: capture ? 'pipe' : 'inherit'});

  return new Promise((resolve, reject) => {
    let stdout = '';

    if (capture) {
      childProcess.stdout.on('data', (data) => {
        stdout += data;
      });
    }

    childProcess.on('error', function (error) {
      reject({code: 1, error: error});
    });

    childProcess.on('close', function (code) {
      if (code > 0) {
        reject({code: code, error: 'Command failed with code ' + code});
      } else {
        resolve({code: code, data: stdout});
      }
    });
  });
};