iwlist wlan0 scan
wlan0     Scan completed :
          Cell 01 - Address: 00:17:3F:9C:65:40
                    ESSID:"belkin54g"
                    Protocol:IEEE 802.11g
                    Mode:Managed
                    Frequency:2.412 GHz (Channel 1)
                    Quality:7/100  Signal level:-91 dBm  Noise level:-96 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
          Cell 02 - Address: 00:1A:C4:C7:B0:91
                    ESSID:"2WIRE075"
                    Protocol:IEEE 802.11g
                    Mode:Managed
                    Frequency:2.462 GHz (Channel 11)
                    Quality:6/100  Signal level:-92 dBm  Noise level:-96 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