Cisc 7310 Operating System

CISC 7310 Operating Systems Fall 2013 Dayton Clark cissh project Due December 4th

Name: ID (4-digit): Introduction

In this project we implement a simple shell called, cissh. I have implemented the some of the shell, you are to complete the implementation of two features. As is cissh can execute commands like “ls”

cissh-| ls ==== ls Distribution Makefile Solution TAGS cissh cissh.c cissh.o cissh.output

cissh.ps cisshSingleCommand.c cisshDescription.odt cisshSingleCommand.o cisshPipe.c discussion.tpl cisshPipe.o solution.output cisshRedirectedInput.csysCallManPages.pdf cisshRedirectedInput.otestScript.txt cisshRedirectedOutput.c cisshRedirectedOutput.o

and “ls > filelist”

cissh-| ls > fileList ==== ls > fileLsist

but cannot execute “sort -r < fileList”

cissh-| sort -r < fileList ==== sort -r < fileList ERROR: cissh: cisshRedirectedInput() is not yet implemented

cissh

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or “ls | sort -r”

cissh-| ls | sort -r ==== ls | sort -r ERROR: cissh: cisshPipe() is not yet implemented.

You are to implement these last two features.

Getting Started

You need to download the cissh distribution file from Blackboard. There is a zip file, cissh.zip, and the electronic version of this file, cissh.doc. Copy it to the Unix system you will use (see below). I believe that “unzip cissh.zip” will do it. This will create a directory called cissh. Enter the cissh directory and type make. This should compile cissh and run it on testScript.txt. You will notice that the redirected input and pipe features do not work. You will need to work on a Unix-like system for this project. Here are several possibilities: • • If you have access to a Linux or other Unix system, that should work. If you have a Windows system you can install cygwin which provides a Unix-like environment on your Windows system. Here is a brief description of how to install cygwin (thanks Maor):

Author: Maor Leger Posted date: Friday, March 19, 2010 12:04:06 PM EDT Last modified date:...