How Do You Find the Storage Space Displaced by a Directory and All of Its Files and Subdirectories on a Linux server?

Problem scenario
How do you find the space used on the disk (e.g., hard disk, SAN or NAS) from the files and subdirectories of a given directory via a Linux command prompt?

Problem scenario
Run a command such as this: sudo du -sh /path/to/subdirectory

It will show you how much space is being consumed (or utilized) by the "subdirectory".