qrencode -s 7 -o qr-wifi.png "WIFI:S:$(zenity --entry --text="Network name (SSID)" --title="Create WiFi QR");T:WPA;P:$(zenity --password --title="Wifi Password");;"
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http://www.commandlinefu.com/commands/view/13028/generate-qr-code-for-a-wifi-hotspot