minishell

FINAL GRADE: 101/100

Made by @prosviriakova and @mglikenf.

Description

Minishell is a 42 School team project aimed at creating a basic shell program in C, designed to enhance understanding of system-level programming and teamwork. It implements redirections and pipes, as well as environment variable expansions and the cd, echo, env, exit, export, pwd and unset builtin commands.

Features

Minishell is a miniature shell program inspired by Bash, designed to replicate its key functionalities:

• Prompt display
• Command history (up and down arrows)
• System executables available from the environment (ls, cat, grep, etc.)
• Local executables (./minishell)
• Builtin commands :
  • echo (and option -n)
  • cd (with only a relative or absolute path)
  • pwd (no options)
  • export (no options)
  • unset (no options)
  • env (no options or arguments)
  • exit (with exit number but no other options)
• Pipes | which redirect output from one command to input for the next
• Redirections:
  • > redirects output
  • >> redirects output in append mode
  • < redirects input
  • << DELIMITER displays a new prompt, reads user input until reaching DELIMITER, redirects user input to command input (does not update history)
• Environment variables (i.e. $USER or $VAR) that expand to their values.
  • $? expands to the exit status of the most recently executed foreground pipeline.
• User keyboard signals:
  • ctrl-c displays a new prompt line.
  • ctrl-d exits minishell
  • ctrl-\ does nothing

However, Minishell does not support \, ;, &&, ||, or wildcards, as these features would require significantly more complex parsing logic and are outside the scope of this project.

Suppression File

Using a suppression file helps Valgrind focus on actual memory leaks in your code by ignoring known issues in external libraries like readline. To run Minishell with Valgrind and suppress readline memory leaks, you can use a suppression file. Example command:

valgrind --leak-check=full --show-leak-kinds=all --suppressions=readline.supp ./minishell

Testing

We thoroughly tested the project using the minishell_tester. Minishell successfully passes all tests.

Subject version: 7.1.