Fun read! I built a minimal Linux shell [0] in c and Zig last year which does not depend on libc. It was a great way to learn about execve, the new-ish clone3 syscall and how Linux starts a process. Parsing strings is the least fun part of the building the shell.
[0] https://gist.github.com/rrampage/5046b60ca2d040bcffb49ee38e8...