Ask the user for confirmation [Y/N]

read -p "Are you sure? " -n 1 -r
echo    # (optional) move to a new line
if [[ $REPLY =~ ^[Yy]$ ]]
then
    echo "Yes"
fi

or more sophisticated:

while true; do
    read -p "Do you wish to install this program?" yn
    case $yn in
        [Yy]* ) make install; break;;
        [Nn]* ) exit;;
        * ) echo "Please answer yes or no.";;
    esac
done

cd into current script's directory

cd "$(dirname "${BASH_SOURCE[0]}")"

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