simple_shell

A custom implementation of the sh (bourne shell) in C.

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Description

This is a simple implementation of a Unix shell, which is a command-line interface allowing users to interact with the operating system by entering and executing commands. The project aims to replicate some basic functionalities of the Unix shell.

Getting Started

Prerequisites

• A Unix-like operating system (Linux, macOS, etc.)
• GCC (GNU Compiler Collection) or any compatible C compiler

Installation

1. Clone the repo root@laptop$ git clone https://github.com/agnilondapakou/simple_shell.git
2. Move to the directory Run: root@laptop$ cd simple_shell
3. Compilation
   3.1. Compilation with Makefile Type root@laptop$ make
   Run the program with root@laptop$ make run
   To clean it, run root@laptop$ make clean, it will remove the hsh program file in the directory.
   3.2. Traditional compilation Type this command : root@laptop$ gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c -o hsh
   Then, run ./hsh to execute the simple shell program

Features

UNIX command line interpreter

Step 1

• Display a prompt and wait for the user to type a command. A command line always ends with a new line.
• The prompt is displayed again each time a command has been executed.
• The command lines are simple, no semicolons, no pipes, no redirections or any other advanced features.
• The command lines are made only of one word. No arguments will be passed to programs.
• If an executable cannot be found, print an error message and display the prompt again.
• Handle errors.
• You have to handle the “end of file” condition (Ctrl+D)
• execve will be the core part of your Shell, don’t forget to pass the environ to it…

Step 2

• Handle command lines with arguments

Step 3

• Handle the PATH
• fork must not be called if the command doesn’t exist

Step 4

• Implement the exit built-in, that exits the shell
• Usage: exit
• You don’t have to handle any argument to the built-in exit

Step 5

• Implement the env built-in, that prints the current environment

More information about bourne shell

Bourne Shell

Authors

Geoffrey Logovi | Agnilonda Pakou