Add dt (delayed tee), like tee but can output to the file that's being read...

Add dt (delayed tee), like tee but can output to the file that's being read from (for example sort foo.txt | dt foo.txt).

Documents/bin/dt

+#!/bin/sh
+set -eu
+
+[ "$#" -gt '0' ] || { echo "Output not specified." >> /dev/stderr; return 1; }
+while [ "$#" -gt '1' ]
+do
+    args="${args:-} $1"
+    shift
+done
+tempfile="$(mktemp -p .)"
+# shellcheck disable=SC2086
+tee ${args:-} "$tempfile" && mv "$tempfile" "$1"