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) in the Elasticache User Guide.