adu creates a database containing disk usage statistics of a given
directory. It allows to query that database to quickly retrieve usage
patterns of subdirectories containing files owned by a given user.

Four different output modes are available: global list, global summary,
user list, 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.

The following example creates a database containing the disk usage patterns
of the /var directory:

	$ adu -C -d /root/adu-var -b /var

Here's a simple query that uses the newly created database to print the
user-summary:

	$ adu -S -d /root/adu-var

	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
	ntp               107     4    23   253k
	gdm               112     3    20   184k
	postfix           106     1    14    56k
	statd             105     4     7    16k
	sgeadmin          111     4     4    12k
	daemon              1     3     4    12k
	www-data           33     3     3     8k
	news                9     2     2     8k
	fetchmail         110     1     1     4k
	libuuid           116     1     1     4k
	localadmin       1000     1     1     1k
	dhcp              100     1     1   992b
	klog              102     2     2   105b
	avahi             114     2     2   105b
	messagebus        108     1     1    80b
	polkituser        117     1     1    40b