code: function exec(command, fallthrough, cb) {
  
    child.exec(command, function (err, stdout, stderr) {
      if (err) {
        console.error('Error: ' + stderr);
        if (fallthrough) {
          // camouflage error to allow other execs to keep running
          cb(null, err);
        } else {
          cb(err);
        }
      } else {
        console.log(stdout);
        cb();
      }
    });
  }
docs: Execute a one-liner command.
  Both stderr and stdout will be logged via console.error/log accordingly.
  Fallthrough is handy in situation where there are multiple execs running in sequence/parallel,
  and they all have to be executed regardless of success/error on either one of them.
  
  @param {String} command: command to execute
  @param {Boolean} fallthrough: allow error to be camouflaged as a non-error
  @param {Function} cb: standard cb(err, result) callback