database shell

printf "Enter a File Name : "
read fname
while [ 1 ]
do

echo " "
echo " ***** MENU **** "
echo "1) Create Record"
echo "2) View Record"
echo "3) Insert Record"
echo "4) Delete Record"
echo "5) Search"
echo "6) Exit"
echo "Enter your choice : "
read ch
case "$ch" in
1)
    echo "CREATE"
    echo "Enter student info : \n"
    echo "Roll No. : "
    read rno
    echo "Name : "
    read name
    echo "Year : "
    read year
    echo "Branch : "
    read branch
    echo "Percentage : "
    read per
    printf "%d\t%s\t%s\t%s\t%s\n" $rno $name $year $branch $per >> $fname
;;
2)
    echo "VIEW"
    if [ -e $fname ]
    then
        cat $fname
    else
    echo "File does not exist"
    fi

;;
3)
    echo "INSERT"
        echo "Enter student info : \n"
        echo "Roll No. : "
        read rno
        echo "Name : "
        read name
        echo "Year : "
        read year
        echo "Branch : "
        read branch
        echo "Percentage : "
        read per
        printf "%d\t%s\t%d\t%d\t%d" $rno $name $year $branch $per >> $fname
;;
4)
    echo "DELETE"
    echo "Enter roll no which u want to delete : "
    read rno
    grep "$rno" "$fname"
    ans=$?
    if [ $ans -eq 0 ]
    then
    echo "Record Found"
    grep -v "$rno" "$fname"
    rm "$fname"
    mv temp.dat "$fname"
    echo "Record deleted !!!"
    else
    echo "Record not found"
    fi
;;


5)
    echo "SEARCH"
        echo " "
        echo "Result of a particular record"
        echo "Enter roll no which u want to search: "
        read rno
        grep "$rno" "$fname"
        ans=$?
        if [ $ans -eq 0 ]
        then
        echo "Record Found"
        else
        echo "Record not found"
        fi
;;
6)
exit
;;
*)
    echo "Invalid choice"
esac
done