This script creates a NATed or Bridged WiFi Access Point.
Feacures:
* Create an AP (Access Point) at any channel.
* Choose one of the following encryptions: WPA, WPA2, WPA/WPA2, Open (no encryption).
* Hide your SSID.
* Disable communication between clients (client isolation).
* IEEE 802.11n & 802.11ac support
* Internet sharing methods: NATed or Bridged or None (no Internet sharing).
* Choose the AP Gateway IP (only for 'NATed' and 'None' Internet sharing methods).
* You can create an AP with the same interface you are getting your Internet connection.
* You can pass your SSID and password through pipe or through arguments (see examples).

https://github.com/oblique/create_ap