How to Submit Lab4

1. Create a directory:

       username.lab4
2. There will be three directories each corresponding to a separate problem. Make sure your name is at the top of every file. Every directory must include a make file to build your executable code. Be sure this file is called makefile. This make file must include a target clean, for removing all executables.
• Directory: ex1

    This is for your gosh shell. It must include
• Source code for building your program
• A make file called makefile
• We will call make and will expect that it will build an executable file called gosh. This file will be executed on the command line (without arguments) to run you gosh shell.
• a transcript file showing your program works.
• Directory: ex2

   This directory will implement the shell pipe using an unamed pipe.
• Source code for building your program
• A make file called makefile
• We will call make and will expect that it will build an executable file called my_upipe. This file will be executed on the command line as follows


       my_upipe "cat /etc/passwd" "grep root"

Your program must except two arguments, each argument will be double-quoted, and your program must respond as the shell pipe:

       cat /etc/passwd | grep root

Your program must respond gracefully to fewer or more than two arguments, by informing the user the proper syntax of the command.

• a transcript file showing your program works.
• Directory: ex3

   This directory will implement named pipes.
• Source code for building your program.
• A make file called makefile
• We will call make and will expect that it will build two executable files called my_npipe_reader and my_npipe_writer. The first file will read from a named pipe what is written by the second file. The second file will obtain its input by prompting a user, and will continue to accept input until the user types 'exit'. The first file will terminate only upon reading 'exit' from the second file.These files will be executed on the command line (without arguments).
• a transcript file showing your program works.
3. When you are finished with your assignment you will create a compressed archive file using tar (this utility stores your directory as a single file, then compresses its size.)

       tar -czvf   username.lab4.tgz   username.lab4
4. You will email your file to our grader Soner Balkir as an attachment.

 

To	soner@cs.uchicago.edu
Attachment	username.lab4.tgz
Subject	CSPP51081 Lab 4