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Change a non-default gem to a default gem in your local environment
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lib Escape regexp interpolation Aug 4, 2019
.gitignore Ignore Gemfile.lock Aug 4, 2019
Gemfile bundle gem gem-default Aug 4, 2019
LICENSE.txt bundle gem gem-default Aug 4, 2019
gem-default.gemspec Version 0.0.2 Aug 4, 2019


Change a non-default gem to a default gem in your local environment.


$ gem install gem-default


Run gem default xxx after gem install xxx.



Usually, we cannot use a non-default gem (pry for example) with bundle exec if it's not written in Gemfile.

$ cat Gemfile
source ''
gem 'rails'

$ gem install pry
Successfully installed pry-0.12.2
Parsing documentation for pry-0.12.2
Done installing documentation for pry after 0 seconds
1 gem installed

$ bundle exec pry
bundler: failed to load command: pry (/home/k0kubun/.rbenv/versions/ruby/bin/pry)
Gem::Exception: can't find executable pry for gem pry. pry is not currently included in the bundle, perhaps you meant to add it to your Gemfile?
  /home/k0kubun/.rbenv/versions/ruby/lib/ruby/2.7.0/bundler/rubygems_integration.rb:378:in `block in replace_bin_path'
  /home/k0kubun/.rbenv/versions/ruby/lib/ruby/2.7.0/bundler/rubygems_integration.rb:406:in `block in replace_bin_path'
  /home/k0kubun/.rbenv/versions/ruby/bin/pry:23:in `<top (required)>'


With gem default command, you can make it available under bundle exec.

$ gem default pry
=> Copying files from "/home/k0kubun/.rbenv/versions/ruby/lib/ruby/gems/2.7.0/gems/pry-0.12.2/bin" to:
/home/k0kubun/.rbenv/versions/ruby/bin/pry (original => /home/k0kubun/.rbenv/versions/ruby/bin/pry.old)

$ cat Gemfile
source ''
gem 'rails'

$ bundle exec pry
[1] pry(main)>


  • Own your risk. This gem may break your Ruby installation.
  • This does not support gems having non-*.rb files under "lib" yet.
    • Patches welcomed.


The gem is available as open source under the terms of the MIT License.

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