gistfile1.txt

# class Parent
#   def knox
#     puts 'parent'
#   end
# end
 
# class Child < Parent
#    def knox
#      puts 'child'
#    end
# end
 
# ch = Child.new
# ch.knox

class Parent
  def knox
    puts 'parent'
  end
end
 
class Child < Parent
   alias_method :parent_knox, :knox
   def knox
     puts 'child'
   end
end
 
ch = Child.new
ch.parent_knox
ch.knox