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Message: [QUOTE="matt neuburg, post: 4555786"] Also I find it useful to have on hand a little utility for generating a report about a class's ancestry, such as this: def method_report(klass) result = klass.ancestors.inject(Array.new) do |result, anc| ms = (anc.instance_methods + anc.methods).sort.uniq result.last[1] -= ms if result.last result << [anc.name, ms] end result.each do |k, v| puts "----", k v.each {|m| puts "\s\s#{m}"} end end # and here's how to use it method_report(File) That's basically what you were already doing in irb, but going a little further. :) HTH - m. [/QUOTE]