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# File lib/rubygems/commands/install_command.rb, line 21
  def initialize
    defaults = Gem::DependencyInstaller::DEFAULT_OPTIONS.merge({
      :format_executable => false,
      :lock              => true,
      :suggest_alternate => true,
      :version           => Gem::Requirement.default,
      :without_groups    => [],
    })

    super 'install', 'Install a gem into the local repository', defaults

    add_install_update_options
    add_local_remote_options
    add_platform_option
    add_version_option
    add_prerelease_option "to be installed. (Only for listed gems)"

    add_option(:"Install/Update", '-g', '--file [FILE]',
               'Read from a gem dependencies API file and',
               'install the listed gems') do |v,o|
      v = Gem::GEM_DEP_FILES.find do |file|
        File.exist? file
      end unless v

      unless v then
        message = v ? v : "(tried #{Gem::GEM_DEP_FILES.join ', '})"

        raise OptionParser::InvalidArgument,
                "cannot find gem dependencies file #{message}"
      end

      o[:gemdeps] = v
    end

    add_option(:"Install/Update", '--without GROUPS', Array,
               'Omit the named groups (comma separated)',
               'when installing from a gem dependencies',
               'file') do |v,o|
      o[:without_groups].concat v.map { |without| without.intern }
    end

    add_option(:"Install/Update", '--default',
               'Add the gem\s full specification to',
               'specifications/default and extract only its bin') do |v,o|
      o[:install_as_default] = v
    end

    add_option(:"Install/Update", '--explain',
               'Rather than install the gems, indicate which would',
               'be installed') do |v,o|
      o[:explain] = v
    end

    add_option(:"Install/Update", '--[no-]lock',
               'Create a lock file (when used with -g/--file)') do |v,o|
      o[:lock] = v
    end

    add_option(:"Install/Update", '--[no-]suggestions',
               'Suggest alternates when gems are not found') do |v,o|
      o[:suggest_alternate] = v
    end

    @installed_specs = []
  end
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