How to show Yes/No prompt in Bash script

#!/bin/bash

read -p "Do you want to continue (Y/N)?"

[ "$(echo $REPLY | tr [:upper:] [:lower:])" == "y" ] || exit

or

#!/bin/bash

echo "Do you want to continue (yes/no)?"
read answer

if [ "$answer" == "yes" ]; then echo "YES"
else echo "NO"
fi

or

#!/bin/bash

while true; do
    read -p "Do you want to continue (Y/N)?" answer
    case $answer in
        [Yy]* ) echo "YES"; break;;
        [Nn]* ) echo "NO"; break;;
        * ) echo "Please answer yes or no.";;
    esac
done

or

#!/bin/bash

echo "What background color do you prefer?"

select answer in "White" "Blue" "Green"; do
    case $answer in
        White ) echo "WHITE"; break;;
        Blue ) echo "BLUE"; break;;
        Green ) echo "GREEN"; break;;
    esac
done