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Re:Modernize your Bash Scripts by adding GUI by yipbub on Monday September 28, 2020 @03:10AM (#24613792)
notify-send is for desktop(possibly gnome only?) notifications.
Re:Modernize your Bash Scripts by adding GUI by jlgaddis on Monday September 28, 2020 @09:15AM (#24616276)
notify-send works by sending notifications to a notification daemon (a.k.a., a "notification server", as defined in the "Desktop Notifications Specification").

notify-send won't work for dudik since, as he said, he doesn't use a notification server.