krishnaroona@krishnaroona:~$ sudo ifconfig wlan0 up
SIOCSIFFLAGS: Operation not possible due to RF-kill
krishnaroona@krishnaroona:~$ ifconfig wlan0
wlan0     Link encap:Ethernet  HWaddr d0:df:9a:c3:23:c3  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)