RBEnv, Ubuntu and Bundler
A how-to for setting up ubuntu 18 for ruby on rails development
Install dependencies
sudo apt install git curl libssl-dev libreadline-dev zlib1g-dev autoconf bison build-essential libyaml-dev libreadline-dev libncurses5-dev libffi-dev libgdbm-dev
There is a new installer, run this
curl -fsSL https://github.com/rbenv/rbenv-installer/raw/HEAD/bin/rbenv-installer | bash
Then setup your shell
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc
source ~/.bashrc
Then use rbenv to install a version of ruby and set it as global
rbenv install 2.6.0
rbenv global 2.6.0
Now this should show you the ruby version
ruby -v
The step other howto's forget; you want to develop in rails right? Then you'll want to install rails in global gems
gem install rails
Alias Goodness
I've been really enjoying these commands to shortcut using bundler exec before everything add these to your ~/.bashrc
alias b="bundle"
alias bi="b install --path vendor"
alias bu="b update"
alias be="b exec"
Older Rubies
If you are installing older versions of ruby on a modern linux like ubuntu 18, you're going to run into GCC compiling issues with errors like ubuntu ruby 2.3.3 moifier ignored since 'D'. This happens because the modern linux uses GCC 7. So lets deal with gcc compatibility issues so we can build older versions of ruby.
sudo apt-get install gcc-6 g++-6 g++-6-multilib gfortran-6
Then install your older ruby like this
CC=/usr/bin/gcc-6 rbenv install 2.3.3
And you're all set
Read more on rbenv and bundler