Using sed and double quotes

Shell Programming and Scripting
1

I am working on a Raspberry Pi and using sed to update the SSID and password but the config file requires the SSID and PSK to both be in double quotes. Below is the code I am using but I cannot figure out how to include the double quotes.

script:

#!/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

Thanks,
Nick

2

using backslash works for me:

 $ a="sid=abc"
$ id=123
$ echo $a|sed "s/sid=.*/sid=\"$id\"/"
 sid="123"
3

Or use " within ' , where the ' ' is split into parts so the shell variable is outside.

  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

Also a combined sed code is attempted.