Advice to fork heredoc was wrong, since we are only allowed one global variable in the project, therefore freeing the parent state in the child was not possible without overriding that rule and possibly getting KO-ed. Setting up a signal handler for the heredoc part was our solution.

Copy the valgrind.supp file and add optionally add an alias, for e.g.:

alias msv='valgrind --leak-check=full --track-fds=yes --show-leak-kinds=all --suppressions=valgrind.supp ./minishell'

For the project we relied on GNU’s readline library to manage user input and command history, but all the rest of the shell was built with raw POSIX syscalls and low-level primitives. Features like process control, redirection, environment handling, and signal management were implemented on top of these system calls.

System calls used:
readline, add_history, printf, malloc, free, write, access, open, read, close, fork, wait, waitpid, signal, sigaction, sigemptyset, kill, exit, getcwd, chdir, unlink, execve, dup, dup2, pipe, perror

The project was tested both on macOS and Linux. On macOS run brew install readline first.

To build and run:

git clone git@github.com:arilebedey/minishell.git
cd minishell
make
./minishell

From there you get a prompt (🥸 💻 petitshell>), and you can run commands like ls, use pipes (ls | wc -l), redirections (cat < in1 > out), and builtins (cd, export, unset, env, echo, exit).

[EN] https://cdn.intra.42.fr/pdf/pdf/154328/en.subject.pdf

https://github.com/decilap/groupdev/

https://github.com/ft-palourde/minishell

https://github.com/mli42/at42minishell

freecodecamp git for pros: https://www.youtube.com/watch?v=Uszj_k0DGsg