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Getting help on how to issue RubyGems commands

$ gem RubyGems is a sophisticated package manager for Ruby.  This is a basic help message containing pointers to more information.   Usage:     gem -h/--help     gem -v/--version     gem command [arguments...] [options...]   Examples:     gem install rake     gem list --local     gem build package.gemspec     gem help install   Further help:     gem help commands            list all 'gem' commands     gem help examples            show some examples of usage     gem help <COMMAND>           show help on COMMAND                                    (e.g. 'gem help install')   Further information:     http://rubygems.rubyforge.org