How can I remove a default gem? ! want to uninstall a gem 1.7.7 version of json

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So based off what I can tell there is no easy command that can move the gemspec file from the default folder to the non-default folder. This is a good thing from what I can tell but here are the instructions on how to do this by hand.

  1. Find the location of the default spec. The easiest way is to go into irb and run the following command:

    irb(main):002:0> Gem.default_specifications_dir
=> "/Users/user/.rubies/ruby-2.5.7/lib/ruby/gems/2.5.0/specifications/default"

    For older rubygems it’s:

    irb(main):001:0> File.join Gem::Specification.default_specifications_dir
=> "/Users/newdark/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/specifications/default"

This is the line of code that builds the gemspec path
https://github.com/rubygems/rubygems/blob/v2.6.13/lib/rubygems/installer.rb#L420

  1. Once you get the file path you just need to move the gem name and version from the default folder to the parent folder. 

    $ cd /Users/newdark/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/specifications/default
$ mv json-1.7.7.gemspec ../

if you do gem list -d you should no longer see the words Installed at (default) next to the gem version json-1.7.7. you can then run gem uninstall json -v 1.7.7 with out it fighting you. If you want to undo all this just run gem install json -v 1.7.7 --default

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