Shell script for installing NodeJS

NodeJS-Installer.sh

echo "Hello, we will now install NodeJS & NPM."
read -p "Would you like to remove an old install first? (Y/n) " -n 1 -r && echo ""
if [[ $REPLY =~ ^[Yy]$ || ! $REPLY ]]
then
    sudo apt-get remove nodejs
    sudo apt-get remove npm
    sudo apt-get autoremove
    echo ""
fi

echo "Outputing held packages, if you have anything here then please abort, and clean."
dpkg --get-selections | grep hold
apt-mark showhold
echo ""
echo "----------------" && echo "If you see anything above this line please abort, and clean."

read -p "Continue? (Y/n) " -n 1 -r && echo ""
if [[ $REPLY =~ ^[Nn]$ && $REPLY ]]
then
	echo ""
	exit
fi

sudo apt-get clean
curl -sL https://deb.nodesource.com/setup | sudo bash -
echo "----------------" && echo "If the above failed, please abort."

read -p "Continue? (Y/n) " -n 1 -r && echo ""
if [[ $REPLY =~ ^[Nn]$ && $REPLY ]]
then
	echo ""
	exit
fi

sudo apt-get install nodejs
sudo apt-get install build-essential
sudo apt-get install npm

echo "" && echo "Getting the latest version of NPM."
npm install -g npm
sleep 2

sudo apt-get clean
npm install -g bower
npm install -g grunt-cli

read -p "Auto append --allow-root to bower? ( This will make changes to ~/.bashrc ) (Y/n) " -n 1 -r && echo ""
if [[ $REPLY =~ ^[Yy]$ || ! $REPLY ]]
then
	echo ''
	echo '' >> ~/.bashrc
	echo "# Added by Node & NPM Install Script. (Please delete any repeates.)" >> ~/.bashrc
	echo 'function bower { command bower "$@" --allow-root; }' >> ~/.bashrc
	. ~/.bashrc
	echo "" && echo "Please review the following changes to your .bashrc"
	cat ~/.bashrc && echo ""
fi