How to use the command `dnsdomainname` (with examples)

The dnsdomainname command is a tool that is used to show the system’s DNS domain name. It retrieves the hostname of the system using gethostname and then resolves it into a canonical name using getaddrinfo. This command is useful for checking the configured DNS domain name of a system.

Use case 1: Show the system’s DNS domain name

Code:

dnsdomainname

Motivation: You may want to check the DNS domain name of your system to ensure that it is correctly configured. This can be useful for troubleshooting network connectivity issues or for checking if the system is part of a specific domain.

Explanation: The dnsdomainname command is a simple command that does not require any arguments. When executed, it retrieves the system’s hostname and resolves it into a canonical name. The resulting canonical name is then displayed as the output, which represents the system’s DNS domain name.

Example output:

example.com

Conclusion:

In this article, we have explored the various use cases of the dnsdomainname command. By using this command, you can easily obtain the system’s DNS domain name, which can be helpful for troubleshooting network issues or verifying system configurations.