finger@ — gets user information from a remote host.
finger@ uses tcpclient(1) to connect to TCP port 79 on
user (followed by a newline), and prints any data that it receives.
It uses addcr(1) to ensure that
user is terminated by CR+LF.
It uses delcr(1) and cat(1) to remove CR (\015) and convert unprintable characters to a visible format.
host is not supplied, finger@ connects to the local host.
user is not supplied, finger@ sends a zero-length string (followed by a newline).
TCP port 79 is the well-known port for the Finger service.
Some computers respond to connections on this port with information about
user is zero-length, some computers respond with information about all of the users who are logged in.