On Mac

Install homebrew, cli tools, cask apps

./setup.bash

On Linux

sudo apt-get install mercurial git libssl-dev exuberant-ctags silversearcher-ag irssi rbenv ruby-build tmux zsh irssi

Setup node on Ubuntu:

curl -sL https://deb.nodesource.com/setup | sudo bash -

Then install:

sudo apt-get install -y nodejs

On Any

Install ruby

rbenv install --list
rbenv install <latest>