Write a script which reads a text file and output key attribute of file

Write a script which reads a text file and output the following 

1). Count of character, words and lines.

2). File in reverse.

3). Frequency of particular word in the file.

4). Lower case letter in place of upper case letter.

File Name : ex15.sh

echo "Enter File Name \c"

read fname

choice=y

while [ "$choice" = "y" ]

do

echo " ------------------------------------"

echo " 1. Count character,words and lines"

echo " 2. Reverse File"

echo " 3. Found frequency of word"

echo " 4. Convert upper to lower"

echo " 5. Convert lower to upper"

echo " 6. Exit

echo " ------------------------------------"

echo "Enter Choice: \c"

read ch

case $ch in

1)

        echo "Total Characters:\c"

        wc -c $fname

        echo "Total Words:\c"

        wc -w $fname

        echo "Total Lines:\c"

        wc -l $fname

        ;;

2)

        rev $fname

        ;;

3)

        echo "Find your word :\c"

       read w

        echo "Frequency:\c"

        grep  -c "$w" $fname

        ;;

4)

        echo "Enter Text : \c"

        read text

        echo $text | tr "[A-Z]" "[a-z]"

        ;;

5)

        echo "Enter Text : \c"

        read text

        echo $text | tr "[a-z]" "[A-Z]"

        ;;

6)         exit

            ;;

*)         echo "Invalid Choice ....."

                        ;;

            esac

 echo "Do u want to continue.....? [y/n]"

 read choice

 case $choice in

  Y|y) choice=y;;

  N|n) choice=n;;

  *) choice=y;;

 esac

done