# File lib/homesick/cli.rb, line 258
    def cd(castle = DEFAULT_CASTLE_NAME)
      check_castle_existance castle, 'cd'
      castle_dir = repos_dir.join(castle)
      say_status "cd #{castle_dir.realpath}",
                 "Opening a new shell in castle '#{castle}'. To return to the original one exit from the new shell.",
                 :green
      inside castle_dir do
        system(ENV['SHELL'])
      end
    end