c-shell

Shell written in C language with custom implementation of some commands and features

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Table of Contents

• Introduction
• Purpose
• Usage and Examples
• Future Improvements

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Introduction

This project is a small, simple shell program for UNIX systems. This program parses a command, checks for the custom commands and operators to handle, and executing them. The custom functions created are to create aliases and to set variables. The program can recognize pipes and input/output redirections.

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Purpose

I wanted to make this project to become more proficient in the C programming language as well as UNIX system calls. This was a way for me to practice these skills and create a project that had some practical use. It taught me a lot about parsing inputs, using processes, and becoming more familiar with UNIX-like operating systems.

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Usage and Examples

Aliases

> myalias list ls

Use aliases to create shortcuts to commands.

Variables

> myset x = abc
> echo @x

Set variables to use in other commands. Use the @ sign to use the variable.

Redirects

> ls -al > list.txt
> wc < list.txt

Use > and < to redirect output and input, respectively.

Pipes

> cat frankenstein.txt | grep beautiful

Pipes use the output of the first command to run the second command. Use the | operator between them.

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Future Improvements

Some future improvements I have planned and thought-out:

• Use a hashtable or other data structure to store variables and aliases to more efficiently find and store them
• Make header file to simplify project
• Improve general efficiency of program