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gem commands
GEM commands are:

    build             Build a gem from a gemspec
    cert              Adjust RubyGems certificate settings.
    check             Check installed gems
    cleanup           Cleanup old versions of installed gems in the local repository
    contents          Disply the contents of the installed gems
    dependency        Show the dependencies of an installed gem
    environment       Display RubyGems environmental information
    help              Provide help on the 'gem' command
    install           Install a gem into the local repository
    list              Display all gems whose name starts with STRING
    query             Query gem information in local or remote repositories
    rdoc              Generates RDoc for pre-installed gems
    search            Display all gems whose name contains STRING
    specification     Display gem specification (in yaml)
    uninstall         Uninstall a gem from the local repository
    unpack            Unpack an installed gem to the current directory
    update            Upgrade the named gem (or all installed gems) in the local repository

For help on a particular command, use 'gem help COMMAND'.

Commands may be abbreviated, so long as they are unambiguous.
e.g. 'gem i rake' is short for 'gem install rake'.