Thanks for the suggestions! I´ll try this tips...hope some day will be a pluggin for this, it will improve the productivity.

Hi:
An .rb is the filename extension for a Ruby script. Ruby is a high level scripting language used for Sketchup to automate repetitive, or multiple operations to achieve a modeling purpose.
How to install on a Mac can be found here for a start:
http://help.sketchup.com/en/article/38583