🐚 Minishell

A beautiful, minimalistic reimplementation of the Unix shell in C, following the strict guidelines of the 42 school curriculum. This project recreates essential features of Bash, including parsing, execution, built-in commands, redirections, pipes, and environment handling, while respecting the complexities of UNIX signal management and memory hygiene.

🚀 Features

✅ Core Requirements

• Custom shell prompt with interactive input using readline
• Command execution via:
  • Absolute and relative paths
  • $PATH lookup
• Quoting support:
  • 'single quotes' — literal interpretation
  • "double quotes" — expansion of $VARIABLES
• Environment variable expansion ($VAR, $?)
• Proper handling of:
  • Ctrl-C — interrupts and redraws prompt
  • Ctrl-D — exits shell
  • Ctrl-\ — ignored

🔁 Built-in Commands

• echo [-n] — print arguments
• cd [dir] — change working directory
• pwd — print current directory
• export [VAR=VALUE] — add/update environment variable
• unset [VAR] — remove environment variable
• env — print environment
• exit — exit shell

🔧 Redirections

• < — redirect input
• > — redirect output (overwrite)
• >> — redirect output (append)
• << — heredoc (input until delimiter)

🧪 Execution & Pipes

• Pipes (|) for chaining commands
• Proper child process handling
• Exit code tracking with $?

🧠 Bonus Features

• && and || logical operators with () for priority
• Wildcard * expansion (glob) in current directory

⚙️ Build & Run

Prerequisites

• Unix-like environment
• GCC compiler
• readline library

Build

make

Run

./minishell

🧼 Makefile Targets

• make / make all — builds the project
• make clean — removes object files
• make fclean — removes all generated files
• make re — rebuilds everything from scratch

🧠 Project Constraints

• Only one global variable allowed (signal handling only)
• Memory leaks must be avoided (except from readline)
• External functions limited to an approved list
• Follow Bash behavior wherever applicable

📜 License

This project is part of the 42 School Curriculum and adheres to their academic integrity rules. Sharing or using this code outside the intended scope is discouraged.