This will encompass things that I find useful and end up looking up later when I haven't coded in a while.
Move file without fileutils
File.rename source_path, target_path
Fix extensions not built errors
Run this command:
gem pristine --all
=begin stuff =end
Install specific version of a gem
bcrypt_pbkdf package that came before version 2.0.
gem install bcrypt_pbkdf -v '<2.0'
Install 2.6.3 and use it by default
rvm install 2.6.3 rvm use 2.6.3 --default