# File lib/dister/cli.rb, line 146
    def package operation, *package
      access_core
      valid_operations = %w(add rm)
      ensure_valid_option operation, valid_operations, "operation"
      case operation
      when "add"
        package.each do |p|
          @core.add_package p
        end
      when "rm"
        package.each do |p|
          @core.rm_package p
        end
      end
      @core.verify_status
      puts "Done."
    end