I would like either a program or more preferably a way to log the disk usage.
In order to explain what I mean, when someone installs Ubuntu there are approximately 4.5 GB of disk used. Then when you install/uninstall programs this usage increases or decreases.
What I want is a way to log automatically the current disk that is used in a txt file when there is a change (something is installed/saved or uninstalled/deleted) with the time and date that this change occurred.