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At that point why not just use a battle-tested config management tool? Ansible, salt, chef, puppet...

I guess I'm having trouble seeing the use-case for having large enough shell scripts to require splitting them up into modules.

What types of functions do you write in shell that you need to re-import?

How is this not achievable by the source builtin?

It's perfectly feasible to have small bash scripts, library functions of sorts, and source them in the script you want to use them in.