BASH script to find the newest file under a directory structure

findNewestFile.sh

#!/bin/bash

if [[ "x${1}" == "x" ]]; then
  dir="."
else
  dir="${1}"
fi

# Based on https://stackoverflow.com/questions/10575665/linux-find-command-find-10-latest-files-recursively-regardless-of-time-span
#   with additions to return only the date of the newest file
find "${dir}" -type f -printf "%C@ %p\n" | sort -rn | head -n 1 | cut -d' ' -f2 | xargs ls -l -t