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apps > linux
document updated 15 years ago, on Aug 24, 2009
To connect to an AP that uses WEP encryption, do something like this: 
iwconfig wlan0 mode managed
iwconfig wlan0 channel 6
iwconfig wlan0 essid "NameOfAccessPoint"
iwconfig wlan0 key restricted <key>
ifconfig wlan0 up
Note that in Ubuntu, you may need to 'apt-get install linux-backports-modules-jaunty.