$ iwconfig
eth0      no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"MANDAMANDAMANDA"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: Not-Associated   
          Tx-Power=20 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          
lo        no wireless extensions.