Scan for all keys with no expiration.

gistfile1.txt

redis = Redis.new(url: REDISGREEN_URL)

cursor = 0

while true do
  cursor, keys = redis.scan(cursor)
  if keys.size < 1
    break
  end
  keys.each do |key|
    ttl = redis.ttl(key)
    if ttl == -1
      p "#{key}"
    end
  end
end