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XDG_CACHE_HOME, as mentioned by numerous other posters, is a good remedy to deal with this kind of cached-artifacts-sprawl - but it does need a will to cooperate and care from the original software developer in the first place, which ain't a given.

So does another standard that I've come to appreciate in all software that supports it: CACHEDIR.TAG (https://github.com/LineageOS/charter/blob/main/device-suppor...) - I'm just here to spread the word! ;)

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Dammit, my clipboard manager messed up the link I was about to post, and now it's too late to edit :/

For posterity: https://bford.info/cachedir/ is what I was meant to link to above. Sorry for the inconvenience.

I went on GitHub to see if anyone was using this cachedir tag signature. Found many results so that’s cool :)

But ironically, if I’m reading correctly the command line ncurses based disk usage tool ncdu seems like it will intentionally ignore any directory that has this cachedir tag.

https://github.com/rofl0r/ncdu/blob/a216bc2d35b6edf4dadf5535...

Which is the very sort of thing the original post was complaining about that happens with invisible .cache directories too :^)

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