Raspberry Pi Wi-Fi Configuration Script via wpa_supplicant.conf

connectwifipi.sh

#!/bin/bash

usage() {
  echo ""
  echo "Raspberry Pi Wi-Fi Configuration Script"
  echo "====================================================================="
  echo "This script stores a secure version of your Wi-Fi network password"
  echo "and automatically configures your Raspberry Pi to connect to the "
  echo "provided Wi-Fi network name."
  echo ""
  echo "Usage: $0 -s <SSID>";
  echo "-s          | SSID (Wi-Fi Network Name) surrounded in quotation marks" 1>&2; exit 1;
}


while getopts ":s:" o; do
  case "${o}" in
    s)
      ssid=${OPTARG}
      ;;
    *)
      usage
      ;;
  esac
done
shift $((OPTIND-1))

if [ "$(id -u)" != "0" ]; then
    echo "This script must be run with root privileges."
    echo "Try: sudo $0 -s <SSID>" 1>&2; exit 1;
fi

if [ -z "${ssid}" ]; then
  usage
fi

sed -i ':again;$!N;$!b again; s/network={[^}]*}//g' /etc/wpa_supplicant/wpa_supplicant.conf
sed -i 's/Passphrase must be 8\.\.63 characters//g' /etc/wpa_supplicant/wpa_supplicant.conf

echo -n "Enter Wi-Fi Password, followed by [ENTER]: "
read -s wifipasswd
echo ""

wifi_config=`wpa_passphrase "${ssid}" "${wifipasswd}" | awk 'NR != 3  { print }'`

echo "${wifi_config}" >> /etc/wpa_supplicant/wpa_supplicant.conf
connection_status=`wpa_cli reconfigure | awk 'NR == 2 { print }'`

case "$connection_status" in
  OK)
    sleep 10
    ip_addr=`ifconfig wlan0 | awk '/inet addr/{ print substr($2,6) }'`
    if [ -z "$ip_addr" ]; then
      echo "Wi-Fi Connection unsuccessful."
      echo "Check your check your Wi-Fi password."
    else
      echo "Wi-Fi Connection successfully established."
    fi
    ;;
  FAIL)
    echo "Wi-Fi Connection failed."
    echo "Make sure the SSID is surrounded in quotation marks and that your "
    echo "Wi-Fi password is 8 - 63 characters long."
    usage
    ;;
esac