Returns a shard iterator.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/dynamodbstreams/get-shard-iterator.html
| aws dynamodbstreams get-shard-iterator \ |
| get-new-images.sh 揃 GitHub : http://gist.github.com/mfine/5bd3bbafc47f65242879 |