msh: minimal shell

Initial implementation based on: write a shell in C

Quick start

$ make -j $(nproc)
$ ./msh

Name		Name	Last commit message	Last commit date
Latest commit History 20 Commits
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
msh.c		msh.c
tui.c		tui.c
tui.h		tui.h