gistfile1.rb

require 'rubygems'
require 'fastercsv'

def normalize(row)
  row[2].sub!(/^0+/, "")
  row[3].sub!(/^0+/, "")
  return row
end

old_rows = FasterCSV.read "old.csv"
new_rows = FasterCSV.read "new.csv"

old_rows.each { |row| normalize(row) }
new_rows.each { |row| normalize(row) }

additions = new_rows - old_rows
deletions = old_rows - new_rows

puts "Additions \n"
additions.each { |a| puts a.inspect }

puts

puts "Deletions \n"
deletions.each { |d| puts d.inspect }