**To enable an IAM role to use longer IDs for a resource** The following ``modify-identity-id-format`` example enables the IAM role ``EC2Role`` in your AWS account to use long ID format for the ``instance`` resource type. :: aws ec2 modify-identity-id-format \ --principal-arn arn:aws:iam::123456789012:role/EC2Role \ --resource instance \ --use-long-ids **To enable an IAM user to use longer IDs for a resource** The following ``modify-identity-id-format`` example enables the IAM user ``AdminUser`` in your AWS account to use the longer ID format for the ``volume`` resource type. :: aws ec2 modify-identity-id-format \ --principal-arn arn:aws:iam::123456789012:user/AdminUser \ --resource volume \ --use-long-ids The following ``modify-identity-id-format`` example enables the IAM user ``AdminUser`` in your AWS account to use the longer ID format for all supported resource types that are within their opt-in period. :: aws ec2 modify-identity-id-format \ --principal-arn arn:aws:iam::123456789012:user/AdminUser \ --resource all-current \ --use-long-ids