Email 101 Part 4

In addition to these domain names, there are many two-letter country codes, e.g.

.ca : Canada

.jp : Japan

.uk : United Kingdom

.us : United States

and many more.

To send electronic mail to someone over the Internet, all you need to know is their "username", or "handle". This is followed by an at-sign, the node name, and any domain names. Thus

[email protected]

donotes a private citizen in Chicago, Illinois, in the U.S. Joe's computer is called "locoweed".

As another (real) example,

[email protected]

is the E-mail address of the U.S. President.

In the examples that follow we will give details for a typical character-oriented computer. Windowing systems with menus, dialog boxes, and so on will hide many of these details, but they are happening behind the scenes. Also, once you are connected, you may be faced with an old-fashioned command-line system.

Electronic Mail (E-mail)

The details of using the mail system depend on your system, but basically it looks like this:

% mail

Welcome to Mail, Version 99.3 ...

mail> send

To: [email protected] Cc: [email protected] Subj: I'm on Internet

Type your message. Control-Z to exit


I just got my Internet connection today. My address is [email protected]

Give my best to Al,




In addition to using an Internet address to send E-mail, you can use it to call a computer. This is rather like dialing up a computer with a modem, except that the local computer (the one you called with *your*

modem) is calling up the remote computer:

your PC or Mac --> "local computer" --> "remote computer"

The example assumes that "home>" is the shell prompt given by your local computer and that "%" is the prompt given by the remote computer (see Section 2.2 on "shell prompts"). So remember, you don't type them.

home> telnet

Welcome to node HOOPLE. Now running Opus 2.0

username: pdq password:

Last login 23:14:55 15-JUN-1752 You have mail.


% logoff

Session with terminated at 21:19.


This method of connecting to another computer is called "telnetting".

In effect, you have used the local computer to telephone the remote computer. You can now do anything on the remote computer (with certain restrictions) you could do if you were "actually" logged on.


Sometimes telnetting will put you into a menu-type program or even a "screen oriented" program. A special problem here is getting the other computer to recognize what type of screen you have. Since most communications software "emulates a terminal", this amounts to telling the other system what type of terminal your communications system is emulating.

E.g., on a UNIX system you might type:

% set term vt100

to tell the other system that your communications software thinks it is a VT100 terminal (a very common choice for emulation programs).

If you don't get this exactly right, your telnet session will "sort of work". It's probably not worth spending a lot of time on this problem for a brief contact with the other computer. If you are going to work on the remote computer every day, however, you will want to get it right. Most "flaky" behavior can be traced to this problem.

File Transfer Protocol (FTP)

It is easy to transfer files over the Internet using a special protocol called FTP. FTP takes the place of programs like XModem or Kermit that may be familiar to you if you use a bulletin board service. Now, you might ask, if FTP transfers a file, what is the differnce between sending E-mail and FTP; why prefer one over the other?

Chapter end

Courier New
Comic Sans MS
Oh o, this user has not set a donation button.
lingua italiana
Русский язык
Novel Cool
Read thousands of novels online
Success Warn New Timeout NO YES Summary More details Please rate this book Please write down your comment Reply Follow Followed This is the last chapter. Are you sure to delete? Account We've sent email to you successfully. You can check your email and reset password. You've reset your password successfully. We're going to the login page. Read Your cover's min size should be 160*160px Your cover's type should be .jpg/.jpeg/.png This book hasn't have any chapter yet. This is the first chapter This is the last chapter We're going to home page. * Book name can't be empty. * Book name has existed. At least one picture Book cover is required Please enter chapter name Create Successfully Modify successfully Fail to modify Fail Error Code Edit Delete Just Are you sure to delete? This volume still has chapters Create Chapter Fold Delete successfully Please enter the chapter name~ Then click 'choose pictures' button Are you sure to cancel publishing it? Picture can't be smaller than 300*300 Failed Name can't be empty Email's format is wrong Password can't be empty Must be 6 to 14 characters