Gem

• gem --help

• gem install bundler

• gem install rollbar

• gem environment
• gem environment --help

• gem environment gemdir

Related terms

• gemfile
• apt install ruby

See also

• RubyGems, gem, gemfile, .gemspecs, gem install, gem environment, gem --help
• Ruby, Sinatra, Ruby on rails, RubyGems, gem, bundle, Rack, Gemfile, Keg-only, brew install ruby@2.7, bundle, JRuby, CocoaPods, apt install ruby, Fog, Puma