WiFi under linux.

Getting info about WiFi connection.

$ /sbin/iwconfig
$ sudo iwlist wlan0 scanning

http://wiki.debian.org/iwconfig

Debian wiki.

http://en.wikipedia.org/wiki/Wireless_tools_for_Linux

Wireless tools for Linux.

https://wiki.archlinux.org/index.php/Wireless_network_configuration

WiFi at Arch wiki.

List of devices.

$ iw dev
$ rfkill list all
$ ip link show

Rfkill caveat.

$ rfkill list
$ rfkill unblock wifi

Enable Wifi in recovery mode.

ifconfig wlan0 up
iwlist wlan0 scan
iwconfig wlan0 essid $NETWORK key s:$PASS