bash switch-case statement gives syntax error -

#!/bin/bash
  
echo "title: " read title echo "" until [ -n "$title" ]     echo "please enter title: "     read title     echo "" done echo "author: " read author echo "" until [ -n "$author" ]     echo "please enter author: "     read author     echo "" done
  
check=cat ./bookdb.txt | egrep -ie "\b""$title""\b" | egrep -ie "\b""$author""\b" if [ -z "$check" ]     echo "error! book not exist!"     #need code continue else     echo "book found!"     all=cat ./bookdb.txt | grep -i "$title"
  
oldtitle=`echo "$all" | cut -d ":" -f1` oldauthor=`echo "$all" | cut -d ":" -f2` oldprice=`echo "$all" | cut -d ":" -f3` oldavail=`echo "$all" | cut -d ":" -f4` oldsold=`echo "$all" | cut -d ":" -f5` 
  
fi     while :          echo ""         echo "  a) update title"         echo "  b) update author"         echo "  c) update price"         echo "  d) update quantity available"         echo "  e) update quantity sold"         echo "  f) main menu"         echo ""         echo -n "please enter choice: "         read option
      case $option in      )          echo -n "new title: "         read newtitle         if [ "$oldtitle" = "$newtitle" ]                 echo "title same original"         else         all_title=`cut -f 1 -d ":" ./bookdb.txt`         check=`echo "$all_title" | grep -i "\b""$newtitle""\b"`         fi             if [ -n "$check" ]                         echo "book title exists."             else             sed -i "s/$oldtitle:/$newtitle:/g" ./bookdb.txt             echo "book title updated."          fi  b )    esac done 

i can't run code on bash. there syntax error @ case selection @ line b )

which see no problem @ all

when using case statements, need end each clause ;;:

case $option in      )         #         ;;     b )         #         ;; esac 

you can read here more details on case statement.