Frontend to rubygems, the ruby package manager
gem2.1 command [arguments...] [options...]
gem2.1 is the frontend to RubyGems, the standard package manager for Ruby. This is a basic help message containing pointers to more information.
Further help:
gem2.1 help commands list all gem2.1 commands
gem2.1 help examples shows some examples of usage
gem2.1 help COMMAND show help on COMMAND, (e.g. 'gem2.1 help install')
http://rubygems.org/
gem2.1 install rake gem2.1 list --local gem2.1 build package.gemspec gem2.1 help install