Shell Programming and Scripting

#!/bin/bash

  read -p "Please specify the Wireless Network SSID: " SSID
  echo "$SSID"
  sudo sed -i -e"s/^ssid=.*/ssid="$SSID"/" /etc/wpa_supplicant/wpa_supplicant.conf
  
  read -p "Please specify the Wireless Network Password: " WIFIPASS
  echo "$WIFIPASS"
  sudo sed -i -e"s/^psk=.*/psk="$WIFIPASS"/" /etc/wpa_supplicant/wpa_supplicant.conf
   
  echo "You need to reboot to connect to the internet"
  echo "1. Reboot Now?"
  echo "2. Exit without Rebooting"
  
  echo -n "Enter your choice: "
  read REBOOT
  echo
  
  case $REBOOT in 
  1)
  sudo reboot
  ;;
  2) 
  echo "You will not have internet access until after you reboot!"
  ;;
  0)
  echo "Thank You"
  ;;
  
esac

 $ a="sid=abc"
$ id=123
$ echo $a|sed "s/sid=.*/sid=\"$id\"/"
 sid="123"

  read -p "Please specify the Wireless Network SSID: " SSID
  echo "$SSID"
  
  read -p "Please specify the Wireless Network Password: " WIFIPASS
  echo "$WIFIPASS"

  sudo sed -i '
s/^ssid=.*/ssid="'"$SSID"'"/
s/^psk=.*/psk="'"$WIFIPASS"'"/
' /etc/wpa_supplicant/wpa_supplicant.conf