bin/cowsayeternal

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#!/bin/bash
cowsaidfile="$(mktemp)"
printf "Writing cows to temporary file \"%s\"\\n" \
"$cowsaidfile"
cowsay "E T E R N A L" > "$cowsaidfile"
trap_exit() {
# kill "$cowthreadpid" > /dev/null 2>&1
wait "$cowthreadpid"
printf "\\n"
cat "$cowsaidfile"
rm "$cowsaidfile"
}
trap trap_exit EXIT
# Cow writing thread
(
while true; do
# Shut up shellcheck; that's the whole point. cowsay does a full read
# before it writes back to the file anyway.
# shellcheck disable=2094
cowsay -n < "$cowsaidfile" 1<> "$cowsaidfile"
done
) &
cowthreadpid=$!
while true; do
# This line will only ever grow larger, so we don't need to clear it
# before overwriting it.
printf "\\r%s bytes of cowsay; hit Ctrl+C to dump them" \
"$(stat --printf="%s" "$cowsaidfile")"
sleep 0.02
done