dump_bucket.rb

#! /usr/bin/env ruby

require 'aws/s3'
include AWS::S3

# set these ENVs for connection
id =  ENV['AMAZON_ACCESS_KEY_ID']
key = ENV['AMAZON_SECRET_ACCESS_KEY']

Base.establish_connection!(access_key_id: id, secret_access_key: key)
bucket = Bucket.find(ARGV[1])

results = bucket.objects.select do |ob|
  ob.key[ARGV[0]]
end

puts results.inspect