In my fork, I've added ./experiments where I hacked together a shell wrapper for a no_std Rust app to implement head -<n>.

help > help.txt <script path>/head -2 help.txt

works. This shows how I can cross-compile code to run in the MesaOS shell. This is a workaround until I have better libraries/APIs for argc/argv handling, file I/O, etc. Fun!