git clone https://github.com/sstephenson/rbenv.git ~/.rbenv

(.bashrc/.zshrc already taken care of in .shellrc)

git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build

(may also want the rehash plugin rbenv-gem-rehash) rbenv-gem-rehash has been integrated into rbenv core, woop.

Try and compile shit to be faster (don't worry if it fails):

cd ~/.rbenv && src/configure && make -C src

~/.rbenv/bin is already in your $PATH because you won config.

~/.rbenv/bin/rbenv init

Which will tell you to add this to .zshrc (should be done)

# Load rbenv automatically by appending the following to ~/.zshrc:

eval "$(rbenv init -)"

Restart your shell because .shellrc only kicks in at startup.

Ignore the eval shit, again, you won. Check if you want to check:

curl -fsSL https://github.com/rbenv/rbenv-installer/raw/master/bin/rbenv-doctor | zsh

mkdir -p "$(rbenv root)"/plugins
git clone https://github.com/rbenv/ruby-build.git "$(rbenv root)"/plugins/ruby-build

Prerequisites for building a ruby (needed on a pi):

apt-get install libssl-dev libreadline-dev

rbenv install --list
rbenv install 2.4.2 # 11/17 stable

(Requisites: https://github.com/rbenv/ruby-build/wiki#suggested-build-environment)