minishell

A shell project built at 42 by azolotar and haaghaja

🧠 Project Overview

minishell is a minimalist UNIX shell created from scratch as part of the 42 school curriculum.

It replicates core features of common shells like bash/zsh, including command execution, environment handling, redirections, pipelines, and more.

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⚙️ Architecture

Our processing pipeline: input → validator → parser → expander → executor

• Input
  User input is read using readline() with history support.

• Validator
  Checks for unmatched quotes, syntax errors, or invalid sequences.

• Parser
  Turns the raw input into a structured format using t_command and t_arg.

• Expander
  Processes:

  • Environment variables ($VAR)
  • Wildcards (*)
  • Quotes removal and expansion rules

• Executor
  Executes built-ins directly or forks for external commands.
  Handles redirections, heredocs, and pipes.

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🧰 Built-in Commands

These are implemented internally (no fork):

• echo
• cd
• pwd
• export
• unset
• exit

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🧱 Operators & Redirections

Logical Operators

• | — pipe
• && — AND (execute next only if previous succeeded)
• || — OR (execute next only if previous failed)

Redirections

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

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🚀 How to Run

make
./minishell