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You probably don't want that. It's a namespacing issue. If you call some new command ls and it has a different API that is a serious affordance issue.

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Then how can you have "cat" and not "ls"?

Oh wow, rewriting cat.. that's definitely a mapping/affordance issue.

I assumed cat was cat!

I don't see cat in the list of commands (https://github.com/askucher/nixar/tree/master/commands). cat is cat.

uniq is there, though

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