picosh

This is a tiny UNIX shell, implemented in C.

The shell supports:

Simple commands, i.e. vim, echo hello world etc.
Pipelines, i.e. ls | wc -l.
File redirection, i.e. echo hello > x and cat < x | grep hello.

However, it does not support:

>> append operator.
2> or 2>&1 or anything more complex.
&, although that should be trivial to add.
Globs, variables, conditionals, loops, functions and it will never be a proper POSIX shell.

Use and explore at your own risk.