Use DescribeDBParameterGroups with an Amazon SDK or CLI

    /// <summary>
    /// Get descriptions of DB parameter groups.
    /// </summary>
    /// <param name="name">Optional name of the DB parameter group to describe.</param>
    /// <returns>The list of DB parameter group descriptions.</returns>
    public async Task<List<DBParameterGroup>> DescribeDBParameterGroups(string name = null)
    {
        var response = await _amazonRDS.DescribeDBParameterGroupsAsync(
            new DescribeDBParameterGroupsRequest()
            {
                DBParameterGroupName = name
            });
        return response.DBParameterGroups;
    }

        Aws::Client::ClientConfiguration clientConfig;
        // Optional: Set to the AWS Region (overrides config file).
        // clientConfig.region = "us-east-1";

    Aws::RDS::RDSClient client(clientConfig);

        Aws::RDS::Model::DescribeDBParameterGroupsRequest request;
        request.SetDBParameterGroupName(PARAMETER_GROUP_NAME);

        Aws::RDS::Model::DescribeDBParameterGroupsOutcome outcome =
                client.DescribeDBParameterGroups(request);

        if (outcome.IsSuccess()) {
            std::cout << "DB parameter group named '" <<
                      PARAMETER_GROUP_NAME << "' already exists." << std::endl;
            dbParameterGroupFamily = outcome.GetResult().GetDBParameterGroups()[0].GetDBParameterGroupFamily();
        }

        else {
            std::cerr << "Error with RDS::DescribeDBParameterGroups. "
                      << outcome.GetError().GetMessage()
                      << std::endl;
            return false;
        }

To describe your DB parameter group

The following describe-db-parameter-groups example retrieves details about your DB parameter groups.

aws rds describe-db-parameter-groups

Output:

{
    "DBParameterGroups": [
        {
            "DBParameterGroupName": "default.aurora-mysql5.7",
            "DBParameterGroupFamily": "aurora-mysql5.7",
            "Description": "Default parameter group for aurora-mysql5.7",
            "DBParameterGroupArn": "arn:aws:rds:us-east-1:123456789012:pg:default.aurora-mysql5.7"
        },
        {
            "DBParameterGroupName": "default.aurora-postgresql9.6",
            "DBParameterGroupFamily": "aurora-postgresql9.6",
            "Description": "Default parameter group for aurora-postgresql9.6",
            "DBParameterGroupArn": "arn:aws:rds:us-east-1:123456789012:pg:default.aurora-postgresql9.6"
        },
        {
            "DBParameterGroupName": "default.aurora5.6",
            "DBParameterGroupFamily": "aurora5.6",
            "Description": "Default parameter group for aurora5.6",
            "DBParameterGroupArn": "arn:aws:rds:us-east-1:123456789012:pg:default.aurora5.6"
        },
        {
            "DBParameterGroupName": "default.mariadb10.1",
            "DBParameterGroupFamily": "mariadb10.1",
            "Description": "Default parameter group for mariadb10.1",
            "DBParameterGroupArn": "arn:aws:rds:us-east-1:123456789012:pg:default.mariadb10.1"
        },
        ...some output truncated...
    ]
}

For more information, see Working with DB Parameter Groups in the Amazon RDS User Guide.

type DbInstances struct {
	RdsClient *rds.Client
}



// GetParameterGroup gets a DB parameter group by name.
func (instances *DbInstances) GetParameterGroup(parameterGroupName string) (
	*types.DBParameterGroup, error) {
	output, err := instances.RdsClient.DescribeDBParameterGroups(
		context.TODO(), &rds.DescribeDBParameterGroupsInput{
			DBParameterGroupName: aws.String(parameterGroupName),
		})
	if err != nil {
		var notFoundError *types.DBParameterGroupNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("Parameter group %v does not exist.\n", parameterGroupName)
			err = nil
		} else {
			log.Printf("Error getting parameter group %v: %v\n", parameterGroupName, err)
		}
		return nil, err
	} else {
		return &output.DBParameterGroups[0], err
	}
}

    public static void describeDbParameterGroups(RdsClient rdsClient, String dbGroupName) {
        try {
            DescribeDbParameterGroupsRequest groupsRequest = DescribeDbParameterGroupsRequest.builder()
                    .dbParameterGroupName(dbGroupName)
                    .maxRecords(20)
                    .build();

            DescribeDbParameterGroupsResponse response = rdsClient.describeDBParameterGroups(groupsRequest);
            List<DBParameterGroup> groups = response.dbParameterGroups();
            for (DBParameterGroup group : groups) {
                System.out.println("The group name is " + group.dbParameterGroupName());
                System.out.println("The group description is " + group.description());
            }

        } catch (RdsException e) {
            System.out.println(e.getLocalizedMessage());
            System.exit(1);
        }
    }

class InstanceWrapper:
    """Encapsulates Amazon RDS DB instance actions."""

    def __init__(self, rds_client):
        """
        :param rds_client: A Boto3 Amazon RDS client.
        """
        self.rds_client = rds_client

    @classmethod
    def from_client(cls):
        """
        Instantiates this class from a Boto3 client.
        """
        rds_client = boto3.client("rds")
        return cls(rds_client)


    def get_parameter_group(self, parameter_group_name):
        """
        Gets a DB parameter group.

        :param parameter_group_name: The name of the parameter group to retrieve.
        :return: The parameter group.
        """
        try:
            response = self.rds_client.describe_db_parameter_groups(
                DBParameterGroupName=parameter_group_name
            )
            parameter_group = response["DBParameterGroups"][0]
        except ClientError as err:
            if err.response["Error"]["Code"] == "DBParameterGroupNotFound":
                logger.info("Parameter group %s does not exist.", parameter_group_name)
            else:
                logger.error(
                    "Couldn't get parameter group %s. Here's why: %s: %s",
                    parameter_group_name,
                    err.response["Error"]["Code"],
                    err.response["Error"]["Message"],
                )
                raise
        else:
            return parameter_group

require "aws-sdk-rds"  # v2: require 'aws-sdk'

# List all Amazon Relational Database Service (Amazon RDS) parameter groups.
#
# @param rds_resource [Aws::RDS::Resource] An SDK for Ruby Amazon RDS resource.
# @return [Array, nil] List of all parameter groups, or nil if error.
def list_parameter_groups(rds_resource)
  parameter_groups = []
  rds_resource.db_parameter_groups.each do |p|
    parameter_groups.append({
                              "name": p.db_parameter_group_name,
                              "description": p.description
                            })
  end
  parameter_groups
rescue Aws::Errors::ServiceError => e
  puts "Couldn't list parameter groups:\n #{e.message}"
end