DSize is a Shell-only utility that shows the sizes of directories.
It was inspired by DirSize by Steve Robb. If you use DirSize,
DSize will be somewhat familiar.

DSize...

  - is fully 64-bit capable: it can handle individual files as well as
    directories that exceed 4 gigabytes in size

  - can accumulate the sizes of multiple directories and produce
    a total line

  - can display results in bytes, kilobytes, megabytes, or gigabytes

  - can have a custom output format for lines

  - can use a wildcard pattern for directories

  - can also use a wildcard pattern for filenames in directories

  - uses localized numeric separator characters unless told not to.

DSize requires DOS library version 52 or better. It uses the newer
directory functions of ObtainDirContext(), ExamineDir(), and
ReleaseDirContext() for 64-bit functionality. This means that you need
AmigaOS 4.0 Final or better to run DSize. DSize was tested with OS4.0
Final with the July 2007 update, and OS4.1 Updates 2 and 3.