SubZero:~# iwlist
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
SubZero:~# iwlist scan
lo        Interface doesn't support scanning.

eth0      Interface doesn't support scanning.

wmaster0  Interface doesn't support scanning.

wlan0     Interface doesn't support scanning : Network is down

SubZero:~# ifconfig wlan0 up
SIOCSIFFLAGS: No such file or directory
SubZero:~# ifconfig wlan0 inet up
SIOCSIFFLAGS: No such file or directory
SubZero:~#