devvspaces/simple_shell

Simple Shell

A simple UNIX command interpreter using C programming.

Introduction

This project creates a simple shell, which is a computer program that exposes an operating system's services to a human user or other programs. The simple shell is written in C language and provides a command-line interface for interacting with the operating system.

Installation

To use the Simple Shell script, follow these steps:

1. Clone the repository to your local machine.
2. Compile the shell script using a C compiler, such as GCC. Using the options -Wall -Werror -Wextra -pedantic -std=gnu89
3. Run the compiled binary to start the shell.

Tasks

0. Betty would be proud

Write a beautiful code that passes the Betty checks

1. Simple shell 0.1

Write a UNIX command line interprete

2. Simple shell 0.2

Handle command lines with arguments

3. Simple shell 0.3

Handle the`PATH`

4. Simple shell 0.4

Simple shell 0.3 +

Implement the`exit` built-in, that exits the shell

5. Simple shell 1.0

Simple shell 0.4 +

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

6. Simple shell 0.1.1

Simple shell 0.1 +

• Write your own getline function
• Use a buffer to read many chars at once and call the least possible the read system call
• You will need to use static variables

7. Simple shell 0.2.1

Simple shell 0.2 +

• You are not allowed to use strtok

8. Simple shell 0.4.1

Simple shell 0.4 +

• handle arguments for the built-in exit
• Usage: exit status, where status is an integer used to exit the shell

9. setenv, unsetenv

Simple shell 1.0 +

Implement the setenv and unsetenv builtin commands

10. cd

Simple shell 1.0 +

Implement the builtin command cd

11.;

Simple shell 1.0 +

• Handle the commands separator ;

12.&& and ||

Simple shell 1.0 +

• Handle the && and || shell logical operators

13. alias

Simple shell 1.0 +

• Implement the alias builtin command
• Usage: alias [name[='value'] ...]

14. Variables

Simple shell 1.0 +

• Handle variables replacement
• Handle the $? variable
• Handle the $$ variable

15. Comments

Simple shell 1.0 +

• Handle comments (#)

16. File as input

Simple shell 1.0 +

• Usage: simple_shell [filename]
• Your shell can take a file as a command line argument
• The file contains all the commands that your shell should run before exiting
• The file should contain one command per line
• In this mode, the shell should not print a prompt and should not read from stdin