guido shows a graphical
representation of how the space on your volumes is utilized. It
uses concentric circles to represent different levels in the file
system hierarchy. In plain words, it shows you in a graphical way
where all your disk space has gone.
You can launch guido from the Tracker, either directly or by dropping
a volume or folder on its icon; or from the Terminal, optionally
passing the names of one or more files or folders as arguments.
If you launch guido without specifying a volume, it will wait until
you drop one or more volumes or folders on its window or select
a volume from the menu.

While guido is scanning a volume, it displays a status bar showing
its progress. Multiple volumes are scanned in parallel (each in
its own thread). You can view the progress on a volume by selecting
that volume from the menu.
The main display
When guido finishes scanning a volume, it displays a graphical representation
of the volume's files and directories.

The circle in the middle represents my /boot/home directory.
Each segment of the ring immediately outside that circle represents
a file or directory within /boot/home.
As you move the mouse over each part of the picture, information
about each file or directory appears in the area at the bottom of
the window. You can resize the window to increase or decrease the
number of levels that guido displays.
Zooming
You can "zoom" in on a directory by clicking the primary mouse button
on it. The picture is redrawn with that directory in the center
circle. You can zoom out one level by clicking the center circle.
At the outermost level, the center circle represents the volume
itself, showing free and used space as pie slices.
Pop-up menu
Clicking the secondary mouse button on a part of the picture pops
up a menu with Tracker-like options applicable to that file or directory.
For directories, the menu includes an option to rescan that directory
and its subdirectories (not the entire volume). This is useful since
guido does not monitor changes to the file system.
Drag-and-drop
You can drag files and directories from guido to other applications
(or to the desktop, the trash, etc.) with the primary mouse button.
You can drop volumes and folders on guido's window to zoom directly
to them.
The number of files that guido reports for a directory includes
files in subdirectories too. A directory counts as a file. guido
ignores symbolic links. If you don't like the colors guido uses,
you can change them with your favorite resource editor.
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