install_ruby.sh

#!/usr/bin/env bash

RUBY_VERSION=2.1.0
printf "Installing Ruby $RUBY_VERSION\\n"

if [ -d ruby_build ]; then
    rm -Rf ruby_build
fi

if [[ ! (`command -v ruby` && `ruby --version | colrm 13` == "ruby" "$RUBY_VERSION""p0") ]] ; then
    sudo apt-get build-dep -y ruby1.9.1
     
    mkdir ruby_build && cd ruby_build
    curl -O "http://ftp.ruby-lang.org/pub/ruby/2.1/ruby-$RUBY_VERSION.tar.gz"
    tar xf "ruby-$RUBY_VERSION.tar.gz"
    cd "ruby-$RUBY_VERSION"
     
    ./configure
    make
     
    sudo checkinstall -y --pkgversion "$RUBY_VERSION" --provides "ruby-interpreter" --replaces="ruby-1.9.2"
    rm -Rf ruby_build
else
    echo "You already have this version of Ruby: $RUBY_VERSION"
fi