Unix utility for tracking down wasted disk space

<rendered-html><p>Most Unix file systems, in their default mode, helpfully record when a file was last accessed. So if you generated a large amount of data years ago, forgot to clean it up, and have never used it since, then it ought in principle to be possible to use those last-access time stamps to tell the difference between that and a large amount of data you’re still using regularly.</p> <p>agedu uses this information to tell you which files waste disk space when you haven’t used them since a long time.</p> </rendered-html>