finger@ host user
finger@ connects to TCP port 79 (Finger)
on host,
sends user (with an extra CR)
to host,
and prints any data it receives.
It removes CR and converts unprintable characters
to a visible format.
Some computers respond to port 79 with information about user.
If user is not supplied, finger@ sends a blank line to host. Some computers respond with information about all the users who are logged in.
If host is not supplied, finger@ connects to the local host.