What modern/surviving Unix-likes don't have even a symlink in `/usr/bin/env`?
I'm not 100% sure on all of these, but every one of the dozens of Linux distros I've used has `/usr/bin/env`. macOS has it, and it looks like FreeBSD does, too, and so does NetBSD.
Who are the oddballs? Does it include any of the free Unices?
(I'm not trying to be shitty; I'd really like to know. I spent some time Googling about conventions for the `env` command, and examples of incompatible systems. The only ones I found were two old, proprietary Unices. I got tired of searching and was hoping someone who knows a few examples offhand could help me out.)
That won't work everywhere either as the location of 'env' is not a fixed standard either. Eg. In some *nix's its at /bin/env.