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23 lines
1.3 KiB
Plaintext
23 lines
1.3 KiB
Plaintext
Unix provides the standard du utility, which scans your disk and tells you which
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directories contain the largest amounts of data. That can help you narrow your
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search to the things most worth deleting.
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However, that only tells you what's big. What you really want to know is what's
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too big. By itself, du won't let you distinguish between data that's big because
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you're doing something that needs it to be big, and data that's big because you
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unpacked it once and forgot about it.
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Most Unix file systems, in their default mode, helpfully record when a file was
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last accessed. Not just when it was written or modified, but when it was even
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read. So if you generated a large amount of data years ago, forgot to clean it
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up, and have never used it since, then it ought in principle to be possible to
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use those last-access time stamps to tell the difference between that and a
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large amount of data you're still using regularly.
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agedu is a program which does this. It does basically the same sort of disk scan
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as du, but it also records the last-access times of everything it scans. Then it
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builds an index that lets it efficiently generate reports giving a summary of
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the results for each subdirectory, and then it produces those reports on demand.
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WWW: https://www.chiark.greenend.org.uk/~sgtatham/agedu/
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