cdu (for Color du) is a perl script which call du and display a pretty histogram with optional colors which allow to imediatly see the directories which take disk space.
With no arguments, cdu reports the disk space for all subdirectories of the current directory.
With only one directory argument, cdu reports the disk space for all subdirectories of the given directory.
You can also call du with no predefined options. For more documentation about available options, see the manpage below.