Finger is a service providing information about a user of a server. The finger-protocol is deactivated on the most Internet servers due to security reasons. So it makes especially sense for intranets and local host administration.
The output of the finger command depends on the system and less standarized, because the output should be easy to read for humans and not for machines.
Deliver First Class Web Sites: 101 Essential Checklists Want to learn how to make your web sites usable and accessible? Want to ensure that your sites meet current best practice, without spending hours trawling through incomprehensible specifications and recommendations from dozens of different books, research papers, and web sites? Want to make sure that the sites you build are "right the first time," requiring no costly redevelopments?