Bash Script to install RVM and ruby, can be run from vagrant to provision a develop environment (run it with start param) or can be run standalone (without params).

installrubyrvmdebian.sh

#!/usr/bin/env bash

cd $HOME

function updateinstall(){
	
	echo -e "Updating system and installing tools...\n"

	sudo apt-get update
	sudo apt-get install -y curl gnupg build-essential
	sudo apt-get install -y gawk libreadline6-dev zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 autoconf libgmp-dev libgdbm-dev libncurses5-dev automake libtool bison pkg-config libffi-dev
}

function installnodeos() {		
 		 
	sudo apt-get install -y nodejs &&		
	sudo ln -sf /usr/bin/nodejs /usr/local/bin/node		
 		 
 	if [[ $? -ne 0 ]]; then
        echo "Error while installing Nodejs, please check...";
        exit 1;
	else
	    source $HOME/.bashrc	
    fi
 }

function installrvm() {

	gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
	curl -sSL https://get.rvm.io | bash -s stable

	if [[ $? -ne 0 ]]; then
            echo "Error while installing RVM, please check...";
            exit 1;
    fi

	echo "source $HOME/.rvm/scripts/rvm" >> ~/.bash_profile
	source $HOME/.rvm/scripts/rvm

}

function loadnvm() {
	export NVM_DIR="$HOME/.nvm"
	[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh" # This loads nvm
}

function installnvm() {

	wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.32.1/install.sh | bash

	if [[ $? -ne 0 ]]; then
            echo "Error while installing Nodejs, please check...";
            exit 1;
	else
	    source $HOME/.bashrc
	    loadnvm
        fi
}

function listnodeversion() {

	nvm ls-remote | less
	echo -e "\n Choose a version from Node to install with nvm install x.x.x or nvm install --lts \n"
}

function listrubyversion() {

	rvm list known
	echo -e "\n Choose a version from Ruby to install with rvm install ruby-x.x.x or rvm install ruby --latest \n"
}

function installnode() {
	
	lts=$1
	
	loadnvm
	
	if [[ -z $lts ]]; then

		listnodeversion
		
		echo -e "Enter node version to install or enter 'lts' to install lts version:" 
	
		read nodever 

		if [[ $nodever != "lts" ]]; then
			nvm install  $nodever
			if [[ $? -ne 0 ]]; then
				echo -e "Error installing node version, check version and try again";
				return 1;
			fi
		else
			nvm install --lts
			if [[ $? -ne 0 ]]; then
				echo -e "Error installing Node...";
				return 1;
			fi
		fi
	else
		nvm install --lts
		if [[ $? -ne 0 ]]; then
			echo -e "Error installing Node...";
			return 1;
		fi
	fi
}

function installruby() {
	
	latest=$1
	
	rvm > /dev/null 2>&1 

	if [[ $? -ne 0 ]]; then
		echo -e "\n RVM not installed or not found check and try again... \n";
		if [[ -z $latest ]]; then
			exit 1;
		else
			main
		fi
	fi

	if [[ -z $latest ]]; then

		listrubyversion
		
		echo -e "Enter ruby version to install or enter 'latest' to install latest version:" 
	
		read rubyver 

        source $HOME/.rvm/scripts/rvm
		if [[ $rubyver != "latest" ]]; then
			rvm install  $rubyver
			if [[ $? -ne 0 ]]; then
				echo -e "Error installing ruby version, check version and try again";
				return 1;
			else
	  			rvm --default use ruby-$rubyver
			fi
		else
			rvm install ruby
			if [[ $? -ne 0 ]]; then
				echo -e "Error installing Ruby...";
				return 1;
			else
				rvm --default use ruby
			fi
		fi
	else
		rvm install ruby
		if [[ $? -ne 0 ]]; then
			echo -e "Error installing Ruby...";
			return 1;
		else
			rvm --default use ruby
		fi
	fi
}

function installbundler(){
	gem install bundler --no-rdoc --no-ri
	if [[ $? -ne 0 ]]; then
		echo -e "Error installing bundler";
		return 1;
	fi
}

function runall(){
	latest=$1
	lts=$2
	
	updateinstall
	installrvm
    echo -e "Install node from Debian(D) repo or Install NVM (N) ? \n"
    read option
    case $option in
        d|D)
                echo -e "Installing node from Debian repo..."
                installnodeos
                ;;
        n|N)
                echo -e "Installing node with NVM..."
	            installnvm
	            installnode $lts
                ;;
        *)
                echo -e "Node not selected, run again this script and select the node option..."
                ;;
        esac
	installruby $latest
	installbundler
	
	username=$(whoami)

	if [[ $username == "vagrant" ]]; then 
		touch /home/vagrant/.provission
	fi
}

function main() {

	echo -e "\n"
	echo -e " What do you want to install: \n 1) Install and update pre-requisites \n 2)Install node from Debian \n 3) RVM \n 4) NVM \n 5) NodeJs \n 6) Ruby \n 7) Bundler \n 8) All \n"

	read option

	case $option in
		1)
			echo -e "Installing pre-requisites...\n"
			updateinstall
			main
			;;
		2)
            echo -e "Installing node from Debian..."
            installnodeos
            main;;
        3)
			echo -e "Installing RVM...\n"
			installrvm
			main
			;;
		4)
			echo -e "Installing NVM...\n"
			installnvm
			main
			;;
		5)
			echo -e "Installing NodeJS... \n"
			installnode
			main
			;;
		6)
			echo -e "Installing Ruby... \n"
			installruby
			main
			;;
		7)
			echo -e "Installing Bundler... \n"
			installbundler
			;;
		8)
			echo -e "Installing all... \n"
			runall
			;;
		*)
	esac
}

pathfile="/home/vagrant/.provission"
	
if [[ -f  $pathfile ]]; then
	if [[ -z $1 ]]; then
		echo -e "Already installed...";
		exit 0;
	fi
elif [[ $1 = "start" ]]; then
	runall latest lts
else
	echo -e "Run this script with start parameter if you try to provission a box"
	main
fi