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 lambda list-layers command can be used to list the Lambda Layers you have created.

aws lambda list-layers

Something like this should be returned.

{
    "Layers": [
        {
            "LayerName": "sam-app7427b055-HelloWorldFunction19d43fc4-DepLayer",
            "LayerArn": "arn:aws:lambda:us-east-1:123456789012:layer:sam-app7427b055-HelloWorldFunction19d43fc4-DepLayer",
            "LatestMatchingVersion": {
                "LayerVersionArn": "arn:aws:lambda:us-east-1:123456789012:layer:sam-app7427b055-HelloWorldFunction19d43fc4-DepLayer:1",
                "Version": 1,
                "Description": "Auto created layer for dependencies of function HelloWorldFunction",
                "CreatedDate": "2023-11-17T02:56:35.074+0000",
                "CompatibleRuntimes": [
                    "python3.9"
                ]
            }
        }
    ]
}

Then the aws lambda delete-layer-version command can be used to delete a specific version of a Lambda Layer.

aws lambda delete-layer-version --layer-name sam-app7427b055-HelloWorldFunction19d43fc4-DepLayer --version-number 1