You can use the whois command to find out who owns a domain name on Linux/UNIX. The whois command is a client for the WHOIS protocol that is used to query databases that store information about registered domain names and other resources on the internet.
To use the whois command to find out who owns a domain name, simply type the following command in your terminal:
whois domain_name
Replace domain_name with the name of the domain you want to look up. For example:
whois example.com
This will display information about the domain name, including its registrar, the date it was registered, and the contact information for the domain owner.
Note that some domain registries may restrict access to WHOIS data for privacy reasons or to comply with data protection laws. In such cases, you may not be able to get detailed information about the domain owner using the whois command.