#!/bin/bash
cowsaidfile="$(mktemp)"
cowsay "E T E R N A L" > "$cowsaidfile"
trap_exit() {
	cat "$cowsaidfile"
	rm "$cowsaidfile"
}
trap trap_exit EXIT
while true; do
	# Shut up shellcheck; that's the whole point. cowsay does a full read
	# before it writes back to the file anyway.
	# shellcheck disable=2094
	cowsay -n < "$cowsaidfile" 1<> "$cowsaidfile"
	printf "%s bytes of cowsay; hit Ctrl+C to dump them\\n" \
		"$(stat --printf="%s" "$cowsaidfile")"
done