/usr/lib/ruby/1.8/ is in rbot 0.9.15+post20100705+gitb3aa806-2ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/1.8/rbot/
/usr/lib/ruby/1.8/rbot/botuser.rb
/usr/lib/ruby/1.8/rbot/compat19.rb
/usr/lib/ruby/1.8/rbot/config-compat.rb
/usr/lib/ruby/1.8/rbot/config.rb
/usr/lib/ruby/1.8/rbot/core/
/usr/lib/ruby/1.8/rbot/core/auth.rb
/usr/lib/ruby/1.8/rbot/core/basics.rb
/usr/lib/ruby/1.8/rbot/core/config.rb
/usr/lib/ruby/1.8/rbot/core/filters_ui.rb
/usr/lib/ruby/1.8/rbot/core/irclog.rb
/usr/lib/ruby/1.8/rbot/core/remote.rb
/usr/lib/ruby/1.8/rbot/core/unicode.rb
/usr/lib/ruby/1.8/rbot/core/userdata.rb
/usr/lib/ruby/1.8/rbot/core/utils/
/usr/lib/ruby/1.8/rbot/core/utils/extends.rb
/usr/lib/ruby/1.8/rbot/core/utils/filters.rb
/usr/lib/ruby/1.8/rbot/core/utils/httputil.rb
/usr/lib/ruby/1.8/rbot/core/utils/parse_time.rb
/usr/lib/ruby/1.8/rbot/core/utils/utils.rb
/usr/lib/ruby/1.8/rbot/core/utils/wordlist.rb
/usr/lib/ruby/1.8/rbot/core/wordlist_ui.rb
/usr/lib/ruby/1.8/rbot/irc.rb
/usr/lib/ruby/1.8/rbot/ircbot.rb
/usr/lib/ruby/1.8/rbot/ircsocket.rb
/usr/lib/ruby/1.8/rbot/language.rb
/usr/lib/ruby/1.8/rbot/load-gettext.rb
/usr/lib/ruby/1.8/rbot/maskdb.rb
/usr/lib/ruby/1.8/rbot/message.rb
/usr/lib/ruby/1.8/rbot/messagemapper.rb
/usr/lib/ruby/1.8/rbot/pkgconfig.rb
/usr/lib/ruby/1.8/rbot/plugins.rb
/usr/lib/ruby/1.8/rbot/rbotconfig.rb
/usr/lib/ruby/1.8/rbot/registry/
/usr/lib/ruby/1.8/rbot/registry/bdb.rb
/usr/lib/ruby/1.8/rbot/registry/tc.rb
/usr/lib/ruby/1.8/rbot/rfc2812.rb
/usr/lib/ruby/1.8/rbot/timer.rb