Life is a constant war against the limited size of backup media. Here is my next weapon in the fight: dusub. Save a du listing today, then find out tomorrow or next week what's been growing:
dusub olddu newduor
du … | dusub oldduPositive numbers in the output represent an item that grew since olddu; negative numbers represent a decrease in size since olddu.
Version 2 knows about "du -h"-style listings.
dusub is useful with sorttop:
du … | dusub olddu | sorttop
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