@justine Here's an exercise I set for students encouraging them to learn how to develop their own command shells able to execute builtins and external commands several years ago. I think this is a good way to learn process management and interfacing 'C' programs to a kernel. I seem to remember implementing an interesting subset of sh or bash this way when I was researching to deliver this set of classes.
https://bcu.copsewood.net/pcnd3/tut5.html
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