gemのインストール場所は、$ gem environment の出力結果の INSTALLATION DIRECTORY で分かる。
❯ gem environment
RubyGems Environment:
- RUBYGEMS VERSION: 3.2.3
- RUBY VERSION: 3.0.0 (2020-12-25 patchlevel 0) [x86_64-darwin19]
- INSTALLATION DIRECTORY: /Users/mi/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0
- USER INSTALLATION DIRECTORY: /Users/mi/.gem/ruby/3.0.0
- RUBY EXECUTABLE: /Users/mi/.rbenv/versions/3.0.0/bin/ruby
- GIT EXECUTABLE: /usr/local/bin/git
- EXECUTABLE DIRECTORY: /Users/mi/.rbenv/versions/3.0.0/bin
- SPEC CACHE DIRECTORY: /Users/mi/.gem/specs
- SYSTEM CONFIGURATION DIRECTORY: /Users/mi/.rbenv/versions/3.0.0/etc
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-darwin-19
- GEM PATHS:
- /Users/mi/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0
- /Users/mi/.gem/ruby/3.0.0
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- https://rubygems.org/
- SHELL PATH:
- /Users/mi/.rbenv/versions/3.0.0/bin
- /usr/local/Cellar/rbenv/1.1.2/libexec
- /Users/mi/.rbenv/plugins/ruby-build/bin
- /usr/local/Cellar/vim/8.2.1600/bin
- /Users/mi/.rbenv/shims
- /Users/mi/.rbenv/bin
- /usr/local/bin
- /usr/bin
- /bin
- /usr/sbin
- /sbin
$ gem environment gemdir でも分かる
/Users/mi/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0