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Now that Leopard, the latest release of Mac OS X, is available to everyone, you may wonder what has changed from the Ruby developer’s perspective.

Ruby

Ruby in Leopard was framework’ized. It is now available in /System/Library/Frameworks/Ruby.framework. Compatibility with the previous directory layout is preserved, /usr/bin/ruby and /usr/lib/ruby

Let see the example symbolic links that point inside the framework:

$ readlink /usr/bin/ruby
../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby
$ readlink /usr/lib/ruby
../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/lib/ruby
$ readlink /usr/lib/libruby.1.dylib
../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/lib/libruby.1.dylib

IRB

Now that readline support is available, IRB has command-line editing and history support.