iwlist

iwlist <interface> scan[ning] 可以列出掃到的 Wi-Fi 網路 (AP 或 Ad-Hoc) 及其它訊息。root 才能驅動掃描，一般使用者只是讀出留下的掃描結果。

iwlist wlan0 scan
          Cell 01 - Address: 9C:D6:43:D0:02:AE
                    Channel:3
                    Frequency:2.422 GHz (Channel 3)
                    Quality=28/70  Signal level=-82 dBm 
                    Encryption key:on
                    ESSID:"my_ap"
                    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
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=000000b8cd99d176
                    Extra: Last beacon: 14628ms ago
                    IE: Unknown: 0004616E6479
                    IE: Unknown: 010882848B960C121824
                    IE: Unknown: 030103
                    IE: Unknown: 050400010000
                    IE: Unknown: 2A0100
                    IE: Unknown: 32043048606C
                    IE: Unknown: 2D1A2C181EFFFF000000000000000000000000000000000000000000
                    IE: Unknown: 3D1603000000000000000000000000000000000000000000
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
                    IE: Unknown: DD1E00904C332C181EFFFF000000000000000000000000000000000000000000
                    IE: Unknown: DD1A00904C3403000000000000000000000000000000000000000000
                    IE: Unknown: DD0600E04C020160
                    IE: Unknown: DD180050F204104A00011010440001021049000600372A000120

其它：

• nm-tool