Bundler keeps ruby applications running the same code on every machine.
It does this by managing the gems that the application depends on. Given a list of gems, it can automatically download and install those gems, as well as any other gems needed by the gems that are listed. Before installing gems, it checks the versions of every gem to make sure that they are compatible, and can all be loaded at the same time. After the gems have been installed, Bundler can help you update some or all of them when new versions become available. Finally, it records the exact versions that have been installed, so that others can install the exact same gems.
gem install bundler bundle init echo "gem 'rails'" >> Gemfile bundle install bundle exec rails new myapp
See bundler.io for the full documentation.
For help with common problems, see ISSUES.
To see what has changed in recent versions of Bundler, see the CHANGELOG.
If you'd like to contribute to Bundler, that's awesome, and we <3 you. There's a guide to contributing to Bundler (both code and general help) over in DEVELOPMENT
Bundler is developed entirely by a team of volunteers. If Bundler saves your company time and money, contribute to the Bundler development fund on Gittip. Every dollar goes towards Bundler documentation, outreach, and development.