Answered: C LANGUAGE ONLY Limited Shell Through…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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C LANGUAGE ONLY

Limited Shell

Through this program, you will learn to do the following:

Work with processes using fork, pipe, wait, dup2, and the exec system calls.
Additional practice with a Makefile with an all target
Work with the different address spaces

The main idea of this program is to write a limited function shell that only runs a few programs from a menu.

Perform "four" small programs to start with followed by the menu program called newshell.

Part 5. newshell

Write a parent program similar to myshell.c but called newshell which will allow the user to choose from a menu of options.

Usage would be: newshell

1 letters
2 numbers
3 firstname
4 userinput
5 letters > filename   (letters redirected to a file)
6 letters | userinput   (letters piped to userinput)
7 firstname| userinput   (names piped to userinput)
8 exit (your program should end by leaving the infinite loop.)

These programs should be completed with the process commands fork, pipe, wait, dup2, and the 6 exec programs. The newshell program should not run any of the other programs, it should fork off children to run the programs.

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