# ip a
# apt-get install network-manager wpasupplicant
# reboot
# nm-tool ------> To get ESSID of WiFi
# wpa_supplicant
#
# cat /etc/wpa.conf
# wpa_supplicat -iwlan0 ic/etc/wpa.conf -B
For Permanent Settings
--------------------------------------
# vi /etc/network/interfaces
...
auto wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa.conf
#