msh

Overview

A shell that implements the parts that teach something: fork, exec, wait, file-descriptor plumbing, signals, process groups and terminal ownership. It builds warning-free with strict flags.

Highlights

• Correct terminal handoff: process groups per pipeline, tcsetpgrp(), WUNTRACED so ^Z shows a stopped job, termios restored after each job.
• 35 non-interactive assertions including a 40-stage pipeline and fd-leak checks; make asan && make test clean.
• Scope stated: no &&/||, subshells, functions or command substitution.