In this problem, we will take you on a quick tour through some of UNIX's simple commands. The solution to this problem consists of your written answers to the boldfaced questions in all parts below, and the printout that you will obtain from part m below.

• a. Log in as described in the ``logging in'' section of Problem #4 in Homework #1.
• b. At the UNIX prompt type ethics. Read and keep in mind what comes out on the screen! Where should violations of the stated guidelines be reported?
• c. At the UNIX prompt type man cal to find out about the ``cal'' program. What is so special about September 1752? Also, use ``man'' to look at the ``script'' command. How does the -a option modify the behaviour of the ``script'' command?
• d. How many people in Boston University have ``Churchill'' as their last name? Use the ph churchill command to find out.
• e. At the UNIX prompt type script hw2-prob1.script to start a script file of your session.
• f. At the UNIX prompt type date to get the date and time.
• f. At the UNIX prompt type csmail to find out which CS mailing lists you are on. Note: ``cs101b1'' should be the only mailing list to which you are subscribed. If that is not the case, then you need to type csmail -a cs101b1 at the Unix prompt to add yourself to the class mailing list.
• h. Find out who is using CSA by typing finger @csa at the UNIX prompt.
• i. Display the calendar for the year in which you were born using the ``cal'' command. For example, if you are born in 1974, type cal 1974. What day of the week were you born?
• j. Use the calc command (interactively) to compute 12+23/7 and to compute (12+23)/7.
• k. Using the webster command, display all the 13-letter words in the English language that start with an ``x'' and end with an ``a''. Also, find out all the words in the English language that start with a ``w'', end with ``nt'' and contain a ``c''. Also, look up the meaning of ``automaton''.
• l. End the script of your session (that started in step e. above) by typing exit.
• m. Get a printout of your script file from one of the printers in the lab. At the UNIX prompt type lpr -Pboris hw2-prob1.script to get the printout on printer ``boris''.
• n. How many lines, words, and characters are there in the script you obtained in part l? Type wc hw2-prob1.script to find out.

In this problem you will go through the process of reading and sending email. There are many programs that one could use to send and receive Electronic Mail. Check the ``Web Resources'' Web Pages for a discussion of such programs. For the purposes of this problem, it does not matter which program you use.

• On Monday September 15, 1997, a personal email message will be sent to each student on the mailing list for this class. Note: You are on the mailing list for this class if you have executed the csmail -a cs101b1 command at the Unix prompt of CSA (see problem 1 above for a command that lists all the CS mailing lists you are on). Read that message and then proceed to the next question.
• Compose an email message and send it to ``cs101b1-hw@cs.bu.edu''. Your email message should include the secret code that will be emailed to you as part of the message you get in question a. above.
  
  
  

Give short answers (on paper) for the following questions on materials covered in the lectures. Note: The answers to some of the questions below were exclusively covered in the class (i.e. not in the textbook).

• What is the difference between a ``program'' and a ``process''.
• Using an example, explain what is meant by the ``the management of concurrent process executions'' by a multiprocessing Operating System.
• What is meant by ``primary memory'', ``secondary memory'' and ``virtual memory''.
• What is meant by a ``multi-user'' Operating System? How is that different from a ``multiprocessing''?
• Could a ``single-user'' Operating System be also a multiprocessing Operating System? Explain your answer.
• What makes it necessary for ROM to be part of a computer primary memory?

Created on: 1997.08.01
Updated on: 1997.09.02
Maintainer: Azer Bestavros
            best@cs.bu.edu