> $ sudo iwlist wlan0 scan
> [sudo] password for aitor:
> wlan0     Scan completed :
>           Cell 01 - Address: 5A:23:8C:7F:C5:51
>                     Channel:1
>                     Frequency:2.412 GHz (Channel 1)
>                     Quality=24/70  Signal level=-86 dBm
>                     Encryption key:on
>                     ESSID:"_EUSKALTELWIFI_KALEAN"
>                     Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
>                               24 Mb/s; 36 Mb/s; 54 Mb/s
>                     Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
>                     Mode:Master
>                     Extra:tsf=000000140b9c8d71
>                     Extra: Last beacon: 32ms ago
>          [...etc...]