aws iam list-attached-user-policies --user-name my-read-only-user

aws iam list-attached-user-policies --user-name my-read-only-user

{
   "AttachedPolicies": [
       {
           "PolicyName": "ReadOnlyAccess",
           "PolicyArn": "arn:aws:iam::aws:policy/ReadOnlyAccess"
       }
   ]
}

See also

• aws iam [ list-policies | list-attached-user-policies | list-group-policies | list-role-policies | put-group-policy | put-role-policy | put-user-policy | create-policy | attach-role-policy ]
• AWS managed policies: ReadOnlyAccess, ViewOnlyAccess, AdministratorAccess, SecurityAudit, ViewBilling, AmazonEKSClusterPolicy, List of AWS policies