How to connect WiFi from Linux command line : WPA/WPA2-PSK

First of all we will have to check that we are working with the wpa configuration file ,

Be sure that you have this section in /etc/network/interfaces :

•    sudo su 
•    vi /etc/network/interfaces
•    And add the following section : , you can figure out what is your interface name with the             command ifconfig , usually it's wlan0 or 1 ..

          auto wlan0
          iface wlan0 inet dhcp
          wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

•   To generate the network block use the command : wpa_passphrase essid_name supersecretpassword

   
     and this will create something like the bellow , and then all you have to do is to add this block to
     /etc/wpa_supplicant/wpa_supplicant.conf

•    So vi /etc/wpa_supplicant/wpa_supplicant.conf , and add this :

     network={ 
          ssid="MyAP111" 
          #psk="MyPassword" 
          psk=cc2499f98beb4dc374d206e56786686cfea3bbb741ac173dbd2a2514e461230a 
     }