**To modify a user** The following ``modify-user`` example modifies a user's access string. :: aws elasticache modify-user \ --user-id user2 \ --append-access-string "on ~* +@all" Output:: { "UserId": "user2", "UserName": "myUser", "Status": "modifying", "Engine": "redis", "AccessString": "on ~* +@all", "UserGroupIds": [], "Authentication": { "Type": "password", "PasswordCount": 1 }, "ARN": "arn:aws:elasticache:us-west-2:xxxxxxxxxx52:user:user2" } For more information, see `Authenticating Users with Role-Based Access Control (RBAC) <https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Clusters.RBAC.html>`__ in the *Elasticache User Guide*.