sysutils/agedu 20200705.2a7d4a2 NetBSD

Suppose you're running low on disk space. You need to free some up, by finding something that's a waste of space and deleting it (or moving it to an archive medium). How do you find the right stuff to delete, that saves you the maximum space at the cost of minimum inconvenience?

Unix provides the standard du utility, which scans your disk and tells you which directories contain the largest amounts of data. That can help you narrow your search to the things most worth deleting.

However, that only tells you what's big. What you really want to know is what's too big. By itself, du won't let you distinguish between data that's big because you're doing something that needs it to be big, and data that's big because you unpacked it once and forgot about it.

Most Unix file systems, in their default mode, helpfully record when a file was last accessed. Not just when it was written or modified, but when it was even read. 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.

agedu does same disk scan as du, but also records the last-access times of everything. Then it builds an index that lets it efficiently generate reports giving a summary of the results for each subdirectory.