Problem scenario
You want to see what IAM permissions a given Linux user on an EC-2 instance has. You tried going to the web console for AWS. You were unable to find the user (e.g., ec2-user or ubuntu). How do you determine which roles the user is a member of?
Solution
From the OS, run this command:curl http://169.254.169.254/latest/meta-data/iam/security-credentials/s3access