# File lib/rubygems/commands/specification_command.rb, line 40
  def execute
    specs = []
    gem = get_one_gem_name
    dep = Gem::Dependency.new gem, options[:version]

    if local? then
      if File.exist? gem then
        specs << Gem::Format.from_file_by_path(gem).spec rescue nil
      end

      if specs.empty? then
        specs.push(*Gem.source_index.search(dep))
      end
    end

    if remote? then
      found = Gem::SpecFetcher.fetcher.fetch dep

      specs.push(*found.map { |spec,| spec })
    end

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

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

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