"du -k" and "du -b" inconsistent output

[Miguel Barão]

This not a bug but rather an inconsistent output between these two du options, 
which is not documented in the manpages.

Suppose 'somefile' is a file containing a lot of zeros.

Then I get:
$ du -k somefile
12
$ du somefile
12
$ du -b somefile
4194432

It seems that du -b is returning the size of the file, and not the "disk 
usage" of that file.

(Using coreutils-5.94, linux on both reiserfs and ext3)

Miguel Barão