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iwlist shows you available wireless networks. It is a command that is part of the Wireless Tools. To install it, install the Wireless Tools.

Example usage:

santosh:~ # iwlist eth3 scanning
eth3      Scan completed :
          Cell 01 - Address: 00:0F:C9:01:F5:F4
                    Protocol:IEEE 802.11bg
                    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
                    Quality=59/100  Signal level=-72 dBm  Noise level=-72 dBm
                    Extra: Last beacon: 24ms ago

santosh:~ #                 

In this case, eth3 is the wireless network device. To find out which is your wireless network device, you can use iwconfig.

See also