code: function create_user(cb) {
    debug('Creating user ' + prey_user + '...');
    exec(__dirname + '/utils/create_user.sh ' + prey_user, function(err, out) {
      if (out) log(out.trim());
  
      // only return error if code == 1
      if (err && parseInt(err.code) == 1)
        return cb(err);
  
      cb();
    });
  }
docs: ////////////////////////////////// the functions themselves