Abrir una consola y ejecutar:
gem environment:
Nos mostrará una salida similar a la que sigue que nos dará muchos datos:
RubyGems Environment:
- RUBYGEMS VERSION: 2.5.1
- RUBY VERSION: 2.3.1 (2016-04-26 patchlevel 112) [x64-mingw32]
- INSTALLATION DIRECTORY: C:/tools/ruby23/lib/ruby/gems/2.3.0
- USER INSTALLATION DIRECTORY: C:/Users/Toni/.gem/ruby/2.3.0
- RUBY EXECUTABLE: C:/tools/ruby23/bin/ruby.exe
- EXECUTABLE DIRECTORY: C:/tools/ruby23/bin
- SPEC CACHE DIRECTORY: C:/Users/Toni/.gem/specs
- SYSTEM CONFIGURATION DIRECTORY: C:/ProgramData
- RUBYGEMS PLATFORMS:
- ruby
- x64-mingw32
- GEM PATHS:
- C:/tools/ruby23/lib/ruby/gems/2.3.0
- C:/Users/Toni/.gem/ruby/2.3.0
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- :sources => ["http://rubygems.org/"]
- REMOTE SOURCES:
- http://rubygems.org/
- SHELL PATH:
- C:\tools\ruby23\bin
- ...