Ephemeral Tempfile in bash

tempfile.sh

#!/bin/bash
set -Eeuo pipefail

# Create a tempfile, get writeable (4) and readable (5) file descriptors.
# Immediately remove the actual temfile, making it inaccessible to other
# processes. This script will hold onto the descriptors until it exits.

tmpfile=$(mktemp)
echo "created $tmpfile"
exec 5<"$tmpfile" 4>"$tmpfile"
rm "$tmpfile"

printf "This is some text\n" >&4
cat <&5