BusyBox v1.20.2 (2013-04-03 01:40:43 CEST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

pkt:~#  insmod /lib/modules/leds.ko
pkt:~#  insmod /lib/modules/rfkill.ko
pkt:~#  insmod /lib/modules/8192cu.ko
pkt:~# iwlist wlan0 scan
wlan0     No scan results

pkt:~# 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
pkt:~# iwlist wlan0 channel
wlan0     11 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Current Frequency:2.412 GHz (Channel 1)

pkt:~# iwlist wlan0 power
wlan0     Current mode:off
pkt:~# /var/bin/wpa_up.sh
Segmentation fault
rfkill: Event read failed: Invalid argument