#!/usr/bin/env bash
set -u

root=${1:?Usage: bash glob-options-demo.sh ROOT}

default_empty=("$root"/empty/*.log)
printf 'default empty matches: %d\n' "${#default_empty[@]}"
printf '  <%s>\n' "${default_empty[@]}"

shopt -s nullglob
null_empty=("$root"/empty/*.log)
printf 'nullglob empty matches: %d\n' "${#null_empty[@]}"

shopt -s dotglob
top_logs=("$root"/logs/*.log)
printf 'dotglob top-level logs:\n'
printf '  %s\n' "${top_logs[@]}"

shopt -s globstar
all_logs=("$root"/logs/**/*.log)
printf 'globstar recursive logs:\n'
printf '  %s\n' "${all_logs[@]}"