adu creates a database containing disk usage statistics of a given
directory. This database can be queried to quickly retrieve, for
example, the number and the size of all files in a subdirectory owned
by a given user.

Four different output modes are available: global list, global summary,
user list and user summary. The format of the output may be customized
via format strings.

There's an interactive mode which allows to quickly launch many queries
on the same database using different modes and different output files.

By default, adu uses the user-summary output format which looks like
this:

	User summary
	root                0   605    12K  267m
	mysql             103     8   144    81m
	postgres          113    19   506    31m
	man                 6    37    87     2m
	syslog            101     1    54     1m
	...

The user-list mode prints the largest directories of one or more users:

	uid 0 (root):
	  55m    8  /var/cache/apt/apt-file/
	  43m   35  /var/lib/apt/lists/
	  27m    6K /var/lib/dpkg/info/
	  25m    4  /var/cache/apt/
	  20m  118  /var/lib/gconf/defaults/