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@Istom1n
Created December 2, 2019 00:28
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Disable macOS Catalina update notification in Mojave
# Ignore Notification of Catalina Update in Mac App Store
sudo softwareupdate --ignore "macOS Catalina"
# Disable the badge
# But this works only until the next time the update checker runs
defaults write com.apple.systempreferences AttentionPrefBundleIDs 0
killall Dock
# Make alias for next update check
alias clearbadge="defaults write com.apple.systempreferences AttentionPrefBundleIDs 0 && killall Dock"
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Istom1n commented Dec 2, 2019

Or you can just use this command for that:
curl https://gist.githubusercontent.com/Istom1n/e4995f3732016904f209aa4296b49a9a/raw/b73fc8b3f9219a83629d0d1387826fe5da81380f/disable-notification-about-catalina.sh | sh -

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