Return the largest file size in a directory

## Problem (Bash / File System) Implement a Bash function (or shell snippet) that returns the **maximum file size** (in bytes) under a given directory. ### Requirements - Input: a directory path `DIR` - Consider **regular files only** (ignore directories; you may ignore symlinks unless you explicitly choose to follow them) - Search **recursively** under `DIR` - Output: a single integer = the size (bytes) of the largest file found - If there are no regular files, output `0` ### Example If `DIR` contains files of sizes 10, 25, and 7 bytes (possibly in subdirectories), output `25`.