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lang-bash
/dev/fdis either a Linuxism or a bashism (bash emulates it on non-Linux operating systems, but not all shells do), so you're already nonportable. Use<&4, not</dev/fd/4.output_fileandnotify-finished, so it will run in a way that successfully demonstrates your bug without the person who wants to see your problem needing to do anything else.</dev/fd/4notation that was causing the trouble. If you second that comment as an answer, I'll accept it. Thank you.