FUNCTION
 Show Disk usage

 SYNOPSIS
 du path

 DESCRIPTION
 Du stands for "disk-usage".  This program returns disk space used by
 a directory or volume.  It attempts to account for all blocks used by
 a file, but the numbers are only estimates.

 ## WARNING: The results of the DU command will vary depending on the
 ## filesystem installed on the device.  This is especially noticable
 ## when DU is used on files in RAM:, as under 2.0 and abover the
 ## ram-handler packs multiple file headers and datablocks together.