This is the take-home final exam, it counts for 15% of your grade.
Please mail it to xiaoge@cs.nyu.edu by May 6, 1999 before 5:00PM.
No late submissions will be accepted.

Problem number 1: 
(You can use the shell(C, korn, Bourne), awk, sed, PERL and/or other utilities listed in chapter 7)

Write a system for distributing software electronically with the following 
features:

	A. There is a database with an account for each potential recipient.
	each entry should contain a variable amount of information about a user:

	username, user first name and last name, email address,
	telephone number, street address, city, state, zip. 
	
	for example:
	an entry can contain the following:
	You are free to use any character to separate different fields.
	I am using a double colon here (:)

	lahmani:Danielle Lahmani:lahmani@cs.nyu.edu:(212)998-3081:252 Mercer Street:NY:NY:10012

	write utilities to add, delete, change, and retrieve entries 
	in the database.
	The database should not have two entries with the same username.

	and  a utility that supports retrieving 
	specific fields from the database based on a username:

	example: dbget lahmani email
	lahmani@cs.nyu.edu

 
	B. include a program to archive files so that they can be restored
or moved to a new location.  The program should create a file that contains
the contents of files in the specified directories and its subdirectories.
the file should be in the format of a shell script so that when the script
 is run, it recreates the directory hierarchy. 
	
	$archive test.d  > archived.sh
	where test.d is a directory.

The shell script generated should be able to be mailed to another user 
and when run will recreate the directory structure.
Assume that you provide only relative pathnames to facilitate testing in 
a different directory under your home directory.


	C. include a program that will generate a form letter to send to a list
recipients  explaining the contents of the shipment and instructions for
unbundling it and will include the script file generated in section B.
The form letter and the contained script file will be mailed to each 
recipient.

The form letter should be tailored to each user's name where the recipient name is a username taken from the database constructed in A.

 $ship -f archived.sh username+

 $ship -f archived.sh lahmani
will produce the following which is mailed to user lahmani@cs.nyu.edu:

Danielle Lahmani
252 Mercer Street
New York, N.Y. 10012

Dear Danielle Lahmani,
		Enclosed please find an archived file. Here are the
instructions for unbundling it....
and here is the archive:
....

Please include sample executions of your system for each section described 
above.

Problem number 2:

Modify the  circular pipes problem listed in homework number 5, exercise number 2 using a client/server paradigm, using sockets in a UNIX domain.
The client will read the string from standard input and send it to the server.
The server will then reverse the string and put it in upper case and will
send it back to the client. The client will write the received string to
standard output.

Please provide a makefile and a sample run with your program.



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