以前紹介したRakがバージョンアップしたようです。

Rak

Rak is a grep replacement in pure Ruby. It accepts Ruby syntax regular expressions and automatically recurses directories, skipping .svn/, .cvs/, pkg/ and more things you don't care about. It is based on the Perl tool ack by Andy Lester.

Patchを送った問題も修正されているようです。変更点は以下のとおり。

0.9 / 2008-02-03

• Added .rake to ruby files
• Colouring works on Win32 if win32console gem is installed.
• Checks that file is readable by the current user.
• Ignores socket files.
• Added .erb and .haml to Ruby filetypes.
• Added search at end-of/start-of line options
• Fixed searching up the directory tree when passed '.'