iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

sit0      no wireless extensions.

eth1      IEEE 802.11g  ESSID:off/any
          Mode:Managed  Frequency:2.462 GHz  Access Point: Not-Associated
          Bit Rate:54 Mb/s   Tx-Power:25 dBm
          RTS thr:2347 B   Fragment thr:2346 B
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0


sudo iwlist eth1 scanning
eth1      Scan completed :
          Cell 01 - Address: 00:0F:A3:E1:91:61
                    ESSID:"Champagney"
                    Protocol:IEEE 802.11b
                    Mode:Managed
                    Frequency:2.462 GHz (Channel 11)
                    Quality:0/100  Signal level:-41 dBm  Noise level:-256 dBm
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:bcn_int=100
                    Extra:atim=0