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I think that’s Linux-only, right?

It's in the /dev/ folder so it looks like a device file provided by the operating system.

But it's not. It's a bash built in pseudo file. So it should work in bash on other operating systems.

Nice thing to learn - thanks. Although the only scenario I can think of at the moment would be the lack of netcat (and telnet).

Not a fan of limiting scripts with bashisms. I like them to be runnable under zsh and similar shells despite having /usr/bin/env bash, /bin/bash, /bin/sh shebang.

A more sneaky use case is for reverse shell payload when you have code execution :)

You're right, it does work on macOS.

What other cool use cases could it achieve besides checking if a domain is reachable?

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