  This command is used to change the password on your account.
 The computer will ask you for the old and new passwords, and
since the computer does not echo the passwords, it will ask you
again for the new password, and verify that the two are the same.
If  they are not you will get an error message.
The new password can be any length, with no imbedded spaces, and
leading or trailing spaces will be ignored.  Make sure that you can easily
type it,and that you can easily remember your new password because it is
impossible look up a password.   (By calling the computer center you can
have it changed if you cannot remember your password).
Note that if you have imbedded spaces or illegal characters you
will get  an error message.  Passwords can have any digit, letter
of the alphabet or underbars (_) in them.
(Note:  It takes about 5 seconds for the command to execute)
*/good_passwords
 When picking a password, most people pick a name or word that to them is
easy to remember, something or someone that they encounter often.
Unfortunately a lot of other people can guess these sorts of passwords
quite easily, and there are people who will change your password, or
monkey with your files.  To prevent this you should pick a password that
no one can guess easily.  We (system management) have serveral ideas
that have worked for us in our passwords, and they are:

	1)  If you must use a name, use one of a distant relative that
no one at Carleton knows about, or a historical figure that is NOT
prominent in the news or your courses.

	2)  Do not use words that come out of one of your hobbies,
as these will be easy to guess as well.

	3)  Use a password of at least 4-5 letters, as people can watch
you type it in, and maybe get the first few letters.  Remember that
a password can be as long as you want.

	4)  As ridiculous as it sounds, a good way to get a password is
to close your eyes, and open a dictionary and point to a word.  Although
some may not be suitable, usually you can find an appropriate word
by the second or third try, that will be easy to remember, but since it
cannot be associated with you, cannot be guessed.
