aws configure
aws configure --profile karan
aws s3 ls
aws s3 ls profile --fubar
vi ~/.aws/config
vi ~/.aws/credentials
aws iam list-users --profile default
[ec2-user@ip-172-31-16-83 .aws]$ aws iam list-users
An error occurred (AccessDenied) when calling the ListUsers operation: User: arn:aws:sts::061116847625:assumed-role/S3FullAccessFromEC2NoCredReq/i-0622cebe406df06cd is not authorized to perform: iam:ListUsers on resource: arn:aws:iam::061116847625:user/
