#!/usr/bin/env bash
# Command substitution and arithmetic expansion

    today=$(date +%F)
    file_count=$(find . -maxdepth 1 -type f | wc -l)

    printf 'Today: %s\n' "$today"
    printf 'Files in current directory: %s\n' "$file_count"

    count=7
    next=$((count + 1))

    ((count += 3))

    printf 'count=%d, next=%d\n' "$count" "$next"