#!/usr/bin/env bash
set -euo pipefail

path="/var/log/app/server.log"
name=${1:-backup}
empty=""

printf "default=%s\n" "${empty:-fallback}"
printf "name=%s\n" "${name^^}"
printf "file=%s\n" "${path##*/}"
printf "dir=%s\n" "${path%/*}"
printf "rotated=%s\n" "${path/%.log/.1.log}"
printf "length=%s\n" "${#name}"