code: function retrieveEnvVars() {
    var env = process.env;
    for(var key in env) {
      var value = env[key];
      if(key.indexOf('WIFI') === 0) {
        var index = parseInt(key.charAt(5));
        targetNetworks[index] = value.split(':');
      }
    }
  }
docs: /* Retrieve target networks from environment variables. Tip: add them to your ~/.bash_profile
  Example:
  export WIFI_1='myfirstnetwork:thecorrectpassphrase'
  export WIFI_2='myfirstnetwork:wrongpassphrase'
  export WIFI_3='anothernetwork:wrongpassword'
  export WIFI_4='anothernetwork'
  export WIFI_5='unsecurednetwork'
  export WIFI_6='wrongnetwork:wrongpassword'