Shell Programming and Scripting

 1) echo "Add option selected, ctrl k then s to save, ctrl k q to quit"
    sleep 2
    echo "Enter setting (format: ABCD=abcd): EDITOR=joe"
    read $add
   # case $add in  
    joe config.txt                                  
    echo "File changed"                 
    echo "Press any key to continue" ; read ;;

As you can see the case statement is making issues with it, if commented out, if lets the script run and enter joe and stays there wanting the user to use it properly. What is the best way?

Rest of the code below:

#!/bin/sh
# Script to simplify editing configuration files
#
echo "Interactive Bourne script to help edit config.txt to change settings with ease"
sleep 2
for config in config.txt
do
  if [ ! -r $config ] ; then
        echo "Cannot read $config, exiting program"
                sleep 2
                exit 0;
                else
                echo "$config found!"
                sleep 2
                fi
                done
while :
 do
 clear
 echo "======================================================================================================="
 echo "*** MENU ***"
 echo "1. Add"
 echo "2. Delete"
 echo "3. View"
 echo "Q. Quit"
 echo "======================================================================================================="
 echo -n "Enter your menu choice [1-3 or q]: "

 read userinput
 case $userinput in
 1) echo "Add option selected, ctrl k then s to save, ctrl k q to quit"
    sleep 2
    echo "Enter setting (format: ABCD=abcd): EDITOR=joe"
    read $add
   # case $add in  
    joe config.txt                                  
    echo "File changed"                 
    echo "Press any key to continue" ; read ;;
 2) echo "Delete option selected"
    echo "Press any key to continue" ; read ;;
 3) echo "View option selected"
    echo "Press any key to continue" ; read ;;
[qQ]*) exit 0 ;;
 *) echo "Please select choice 1,2,3 or q";
 echo "Press any key to continue" ; read ;;
 esac
 done