MacOS – Reinstalling ruby

macosruby

I somehow screwed up my ruby installation. It says:

ruby ....
/Library/Ruby/Site/2.0.0/rubygems.rb:1098:in `register_default_spec': undefined method `default_gems_use_full_paths?' for Gem:Module (NoMethodError)
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:699:in `block in load_defaults'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:647:in `block (2 levels) in each_spec'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:643:in `each'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:643:in `block in each_spec'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:642:in `each'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:642:in `each_spec'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:653:in `each_default'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:698:in `load_defaults'
from /Library/Ruby/Site/2.0.0/rubygems.rb:1239:in `<top (required)>'
from <internal:gem_prelude>:1:in `require'
from <internal:gem_prelude>:1:in `<compiled>'

I updated all gems or something that like. How can I revert to the original ruby installation? I guess I have a timemachine backup, but maybe a clean reinstall is better.

Edit: OK, I deleted the gems as suggested in an answer, but when I try to reinstall them, I get:

gem install flickraw
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems /core_ext/kernel_require.rb:55:in `require': cannot load such file -- rubygems/util (LoadError)
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Site/2.0.0/rubygems.rb:527:in `gunzip'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/remote_fetcher.rb:275:in `fetch_path'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/remote_fetcher.rb:304:in `cache_update_path'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/source.rb:130:in `load_specs'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/spec_fetcher.rb:230:in `tuples_for'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/spec_fetcher.rb:199:in `block in available_specs'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/source_list.rb:55:in `each'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/source_list.rb:55:in `each_source'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/spec_fetcher.rb:195:in `available_specs'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/spec_fetcher.rb:81:in `search_for_dependency'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/spec_fetcher.rb:139:in `spec_for_dependency'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/dependency_installer.rb:156:in `find_gems_with_sources'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/dependency_installer.rb:303:in `find_spec_by_name_and_version'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/dependency_installer.rb:109:in `available_set_for'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/dependency_installer.rb:329:in `install'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/commands/install_command.rb:166:in `block in execute'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/commands/install_command.rb:158:in `each'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/commands/install_command.rb:158:in `execute'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/command.rb:305:in `invoke_with_build_args'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/command_manager.rb:170:in `process_args'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/command_manager.rb:130:in `run'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/gem_runner.rb:60:in `run'
from /usr/bin/gem:21:in `<main>'

Best Answer

You should be able to clean up all of your Ruby gems with this Terminal command:

sudo rm -rf /Library/Ruby/Gems/#num

Where #num is your installed Ruby version (for Yosemite and Mavericks, that should be 2.0, and for Snow Leapard, Lion, and Mountain Lion, it should be 1.8).

It should also keep all system-provided gems intact, which is a good thing, because some applications may require them.

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