This assumes you have already configured the aws command line tool. If not, check out my article on Getting Started with the AWS CLI.

The aws secretsmanager list-secrets command can be used the list the secrets you have created.

]$ aws secretsmanager list-secrets
{
    "SecretList": [
        {
            "ARN": "arn:aws:secretsmanager:us-east-1:123456789012:secret:my-secret-tD1U2U",
            "Name": "my-secret",
            "Description": "my-secret",
            "LastChangedDate": "2023-08-23T17:23:54.741000-05:00",
            "LastAccessedDate": "2023-08-22T19:00:00-05:00",
            "SecretVersionsToStages": {
                "0a8aa38f-b95e-42ab-acc9-7745aa710f23": [
                    "AWSCURRENT"
                ]
            },
            "CreatedDate": "2023-08-23T17:23:54.435000-05:00"
        }
    ]
}

Then the aws secretsmanager delete-secret command can be used to delete a secret.

aws secretsmanager delete-secret --secret-id arn:aws:secretsmanager:us-east-1:123456789012:secret:my-secret-tD1U2U