Automatically run Ruby scripts with "bundle exec" (but only when appropriate).
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bundler is a great way to manage the gem dependencies in your Ruby project.

One of bundler's nifty features is the bundle exec command which allows you to run an executable (such as rake) in the context of your bundled gem dependencies. In other words, you'll only be able to access the gems that you've told bundler that you want to use.

To run a command in this way you need to prefix it with 'bundle exec', like so:

$ bundle exec rake my:task

It's something that you really ought to be doing whenever you run a ruby script within a bundled project, but, alas, it can become a chore.

Enter bundler-exec, which takes care of automatically pre-pending "bundle exec" to the beginning of common Ruby commands.


  1. Copy to ~/
  2. Source it from your ~/.bashrc file.

For example:

$ cp bundler-exec/ ~/
$ echo "[ -f ~/ ] && source ~/" >> ~/.bashrc

Er, that's it...

You can get bundler by installing the gem:

$ gem install bundler

See for more about bundler.