# File lib/rubygems/commands/specification_command.rb, line 39
  def execute
    specs = []
    gem = get_one_gem_name

    if local? then
      source_index = Gem::SourceIndex.from_installed_gems
      specs.push(*source_index.search(/\A#{gem}\z/, options[:version]))
    end

    if remote? then
      alert_warning "Remote information is not complete\n\n"

      Gem::SourceInfoCache.cache_data.each do |_,sice|
        specs.push(*sice.source_index.search(gem, options[:version]))
      end
    end

    if specs.empty? then
      alert_error "Unknown gem '#{gem}'"
      terminate_interaction 1
    end

    output = lambda { |spec| say spec.to_yaml; say "\n" }

    if options[:all] then
      specs.each(&output)
    else
      spec = specs.sort_by { |spec| spec.version }.last
      output[spec]
    end
  end