Plan 9 also more or less does away with the concept of $PATH in the first place; just union-mount (with `bind`) whatever you want onto `/bin` and call it a day.

Plan 9 also more or less does away with the concept of $PATH in the first place; just union-mount (with `bind`) whatever you want onto `/bin` and call it a day. Yet another thing that would've been great for Unix-likes to pull in (I think some Linuxen can technically do it, but with some limitations).