If you finger using a person's login name as an argument, you will get more information about that user. Finger takes several options that are described on page 38 of the text. If you look up finger in UNIX in a Nutshell , you will find it takes even more options. If not, perhaps you should review the text again. These can be thought of as changing the way a command behaves.
Arguments are another program modifier.
We are going to skip mail in Chapter 3 at present. We will come back to it and discuss it in detail. There are users who like to chat on the Internet. The bandwidth is too low. One legitimate use of talk is to communicate with the system administrator or another user to solve a problem.