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bundle exec

Run the command in context of the bundle
$ bundle exec [--keep-file-descriptors]


--keep-file-descriptors: For Ruby versions less than 2.0, keeps non-standard file descriptors on Kernel#exec

Exec runs a command, providing it access to the gems in the bundle. While using bundle exec you can require and call the bundled gems as if they were installed into the systemwide RubyGems repository.