Use CLI to configure Wifi on debian for Raspberry Pi

Raspbian is a customized Debian on Raspberry Pi, and it’s almost same as Debian.

Thank god Raspberry Pi 3 builds with a wireless module, we don’t need to spend $10 on a USB wifi card.

This post talks about how to configure wifi on CLI mode.

1. Update /etc/network/interfaces and make sure it looks like below:

   ``` auto lo iface lo inet loopback

   allow-hotplug wlan0 auto wlan0

   iface wlan0 inet manual wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf ```

2. Create or update /etc/wpa_supplicant/wpa_supplicant.conf

   update_config=1 network={ ssid="Your Wifi Network" #psk="your password" psk=<encryped_passphase> }

   Attention: wpa will never use plain password for connecting wifi, you need to passphase it and put it here.

   Actually there’s a simple way to generate this file, just use command below:

   wpa_passphrase <your_wifi_name> <your_wifi_password> > /etc/wpa_supplicant/wpa_supplicant.conf

   After this, just put update_config=1 in the first line of that file.

3. Restart OS and you will see your Raspberry Pi is already connected to Wifi