Package Manager RubyGems

Documentation

• gem install <gem_name> install a gem globally
• gem list list all installed gems
• gem uninstall <gem_name> uninstall a gem
• gem update update all installed gems
• gem update <gem_name> update a specific gem

Dependency Management bundler

Documentation

• gem install bundler install bundler
• bundle init init a new gemfile
• bundle install install all gemfile dependencies
• bundle update update dependencies
• bundle exec <gem_name> run a script bundle exec rspec
• bundle add <gem_name> add a gem to the gemfile and install it
• bundle remove <gem_name> remove a gem from the gemfile and uninstall it
• bundle check verify all dependencies are installed

Version Manager rbenv

Documentation

• rbenv install <version> install a specific ruby version
• rbenv install --list list all available ruby versions
• rbenv versions list installed ruby versions
• rbenv global <version> set a ruby version globally
• rbenv local <version> set a ruby version locally for the current project
• rbenv uninstall <version> remove a ruby version

# .ruby-version
3.2.2

Gemfiles

gem "colorize", "~> 1.1", "< 1.4"
gem "library", "~> major.minor.patch", '< less_than'

Version locking:

• ~> last digit can increase
  • ~> 1.1 → up to 1.9.9
  • ~> 1.1.3 → up to 1.1.9
• >= at least
• = exact