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/usr/bin/ri2.0 is in ruby2.0 2.0.0.484-1ubuntu2.

This file is owned by root:root, with mode 0o755.

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#!/usr/bin/ruby2.0

begin
  gem 'rdoc'
rescue NameError => e # --disable-gems
  raise unless e.name == :gem
rescue Gem::LoadError
end

require 'rdoc/ri/driver'

RDoc::RI::Driver.run ARGV