They definitely exist on a spectrum. Some are used super-regularly, others I've never heard of. `ptx` and `tsort` come to mind as esoteric; I'm not even sure wh

They definitely exist on a spectrum. Some are used super-regularly, others I've never heard of. `ptx` and `tsort` come to mind as esoteric; I'm not even sure what `ptx` does! Some are a bit redundant, as well (e.g., `dir`, `link`, etc.)