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42 minishell

This project was developed together with PauliusMinialga

About the project

Task

The goal of this project was to write your own little shell with bash serving as a reference for most cases. Given its nature, the shell should run in an interactive session, allowing for user input, which is then validated, tokenized, and parsed before it is eventually executed. Of course, a shell wouldn't be too useful without its built-ins. Find a more extensive list of the features below:

Features

  • Input and output redirections
  • Here-doc support
  • Pipes
  • Environment variables
  • Quotes ("", '')
  • Exit codes ($?)
  • Signals (Ctrl-C, Ctrl-D, Ctrl-)
  • Built-ins (echo, cd, pwd, export, unset, env, exit)
  • History

Responsibilities

  • Paulius: execution, signals
  • Me: parsing, variable expansion
  • Both: debugging, built-ins

Technologies

  • The shell is written entirely in C and can be compiled using a Makefile
  • As a team we heavily relied on git as a VCS

Learnings

Teamwork

  • Effective work division and milestone setting
  • Git usage in a team (branching, merging, rebasing, preventing merge conflicts, solving merge conflicts ;) etc.)
  • Considerate and effective communication

Compilers / programming languages

  • Language definition through grammars
  • Implementation of grammars through lexers and parsers
  • Parsing algorithms

Utilization

Cloning

Run the following command to clone the repo and build the executable:

git clone https://github.com/michmos/42_minishell.git && cd 42_minishell && make

Running

Run the executable:

./minishell