bundle

Install dependencies

$ bundle install

$ bundle update

$ bundle exec [rake test]

$ bundle show [rails]

$ bundle gem [my_gem]

bundle command [options]

bundle (Bundler) is a dependency manager for Ruby. It ensures that the exact gem versions specified in a Gemfile are installed and loaded, preventing version conflicts and ensuring consistent environments.
The tool is essential for Ruby development and comes bundled with Ruby since version 2.6.

install

Install gems from Gemfile

Update gems

Execute command with bundle environment

Show gem installation path

List installed gems

Show outdated gems

Remove unused gems

Create/update Gemfile.lock

Create new gem scaffold

Gemfile specifies dependencies:

$ source 'https://rubygems.org'

gem 'rails', '~> 7.0'
gem 'pg', '>= 1.0'
gem 'puma'

group :development do
  gem 'debug'
end

- Dependency resolution
- Version locking (Gemfile.lock)
- Isolated gem environments
- Gem groups (development, test, production)
- Local gem path override
- Git repository gems

Gemfile.lock should be committed for apps (not gems). bundle exec needed to use correct versions. Local gem modifications lost on bundle install. Conflicts possible with system gems. Large projects have slow resolution.

Bundler was created by Carl Lerche, Yehuda Katz, and André Arko around 2009 to solve Ruby's dependency management problems, becoming the standard in 2010.

gem(1), ruby(1), rake(1)