[Level 2] How to connect wireless ap by command in Ubuntu.

How to connect wireless ap by command in Ubuntu?
You can use two commands, 'iwlist', 'iwconfig'.
# iwlist --help
Usage: iwlist [interface] scanning [essid NNN] [last]
              [interface] frequency 
              [interface] channel 
              [interface] bitrate 
              [interface] rate 
              [interface] encryption 
              [interface] keys 
              [interface] power 
              [interface] txpower 
              [interface] retry 
              [interface] ap 
              [interface] accesspoints 
              [interface] peers 
              [interface] event 
              [interface] auth 
              [interface] wpakeys 
              [interface] genie 
              [interface] modulation 
# iwlist wlan0 scanning essid ap_name
# iwconfig --help
Usage: iwconfig [interface]
                interface essid {NNN|any|on|off}
                interface mode {managed|ad-hoc|master|...}
                interface freq N.NNN[k|M|G]
                interface channel N
                interface bit {N[k|M|G]|auto|fixed}
                interface rate {N[k|M|G]|auto|fixed}
                interface enc {NNNN-NNNN|off}
                interface key {NNNN-NNNN|off}
                interface power {period N|timeout N|saving N|off}
                interface nickname NNN
                interface nwid {NN|on|off}
                interface ap {N|off|auto}
                interface txpower {NmW|NdBm|off|auto}
                interface sens N
                interface retry {limit N|lifetime N}
                interface rts {N|auto|fixed|off}
                interface frag {N|auto|fixed|off}
                interface modulation {11g|11a|CCK|OFDMg|...}
                interface commit 
       Check man pages for more details.
# iwconfig wlan0 essid ap_name
# iwconfig wlan0 enc passphrase
# dhclient wlan0
Wish this helps. regards, Stanley Huang

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