2019/2/2のhomebrew 2.0.0リリースノートに書いてありました。 30日ごとに自動で brew cleanupが走るbrew install / brew update / brew reinstall を実行すると併せて走るこれが嫌なときは HOMEBREW_NO_INSTALL_CLEANUPという変数を使う brew cleanup is run periodically (every 30 days) and triggers for individual formula cleanup on reinstall, install or upgrade. You can opt-out of this behaviour by setting the HOMEBREW_NO_INSTALL_CLEANUP variable. This addresses a lon
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