drew@mini ~ $ aws --profile billing_ro_access s3 ls omg-my-aws-bills-are-scary
2017-04-30 15:11:26     325195 32568XXXXXXX-aws-billing-detailed-line-items-2017-04.csv.zip
2017-04-30 15:11:45     900216 32568XXXXXXX-aws-billing-detailed-line-items-with-resources-and-tags-2017-04.csv.zip
2017-04-30 15:53:24      37141 32568XXXXXXX-aws-cost-allocation-2017-04.csv
2017-04-30 15:53:24          4 aws-programmatic-access-test-object