# Bring Wireless Up
sudo ifup wlan0

# Scan for wireless networks
sudo iwlist wlan0 scan

# Open the wpa-supplicant configuration file in nano:
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
# ----------
network={
  ssid="YOUR_SSID"
  scan_ssid=1
  psk="YOUR_PASSKEY"
  mode=0
  proto=WPA2
  key_mgmt=WPA-PSK
  pairwise=CCMP
  group=CCMP
  auth_alg=OPEN
  id_str="raspi"
  priority=1
}
# ----------

# Restart Interface
sudo ifdown wlan0
sudo ifup wlan0

# Check Interface for IP
ifconfig wlan0