A while ago I saw a nice Tweet on how to create QR codes from the command shell. There using the command qrencode.

This command can be used to display a WiFi Password. With an iPhone or Android (10) you’re able to scan QR code and connect to Wifi.It is more comfortable than entering the password on a phone.

The string that will be placed within the QRcode needs to follow a specific format, here is an example for this:

qrencode -o - 'WIFI:T:WPA;S:MyNetworkName;P:ThisIsMyPassword;; ' |display

The command will generate the following QR code that can be used by a mobile device. Scanning it with the camera app will ask you to connect to the given Wifi:

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