Shell Programming and Scripting

# MENU
error_flag=0
balance=0
while true
do
if [ $error_flag -eq 0 ]
then
  tput clear
  echo "Welcome valued customer"
  echo "Please choose from the following options:"
  echo "1: Deposit "
  echo "2: Withdrawal "
  echo "3: Display balance "
  echo "4: Quit "
fi
error_flag=0
echo " Please enter your choice>......."
read choice
case $choice in
  1) printf "How much $ would you like to deposit?"
     read deposit
     ((balance = $deposit + $balance))
     printf "Your current balance is now $balance" ;;

  2) echo "How much $ would you like to withdraw?" ;
     read withdraw
     (( withdraw=$withdraw /- $balance ))
     echo "Your remaining balance is $balance dollars" ;;

  3) echo "Your current balance is $balance dollars" ;;
  4) echo "Thank you for banking with us"
     exit 0 ;;
  *) echo "Please only type the options given in the menu"
     error_flag=1 ;;
esac
export balance
export deposit
export withdraw
done
exit 0

case "$choice" in
  1) printf "How much $ would you like to deposit?"
     read deposit
     ((balance = $deposit + $balance))
     printf "Your current balance is now $balance"
     sleep 5
     ;;