Minishell

This repository contains the implementation of the Minishell project. The project involves building a basic shell that mimics the behavior of the popular bash shell. It covers fundamental concepts such as process creation, input/output redirection, and signal handling.
The goal of the Minishell project is to help understand how a shell works by building a minimal version of bash. For that, we need to learn how to handle user input, execute commands, manage processes, and work with file descriptors. This project is a great opportunity to get familiar with the Unix programming environment and its system calls.

Features

Mandatory Part

• Shell Basics:

  • Display a prompt while waiting for a new command.
  • Parse and execute commands based on the PATH environment variable or using relative/absolute paths.
  • Implemented a simple history of executed commands.
    
    

• Redirections:

  • <: Redirect input from a file.
  • >: Redirect output to a file, overwriting if the file exists.
  • >>: Append output to a file.
  • <<: Here-document. Read input until a given delimiter is encountered.
    
    

• Pipes:

  • Implemented the | character to pipe the output of one command into the input of another.
    
    

• Environment Variables:

  • Handle expansion of environment variables using $ followed by a sequence of characters.
  • Support $? to get the exit status of the most recently executed foreground pipeline.
    
    

• Signal Handling:

  • Ctrl+C: Display a new prompt on a new line.
  • Ctrl+D: Exit the shell.
  • Ctrl+\: Do nothing.
    
    

• Built-in Commands:

  • echo with -n option
  • cd with relative or absolute path
  • pwd with no options
  • export with no options
  • unset with no options
  • env with no options or arguments
  • exit with no options
    
    

Bonus Part

• Logical Operators:
  • Implement && and || with support for parentheses for precedence.
    
    
• Wildcards:
  • Implement wildcard * expansion in the current working directory.
    
    

How to run

1. Clone repository

   git clone [email protected]:mjorgecruz/42_minishell.git

Mandatory part

2. Go inside project directory and run make

   cd 42_minishell
   make

3. Run ./minishell
   
   

   ./minishell

Credits

• Jorge Cruz
• Luis Carvalho