notify-send

Uses the current desktop environment's notification system to create a notification. More information: https://manned.org/notify-send.

notify-send "Test" "This is a test"

notify-send -i icon.png "Test" "This is a test"

notify-send -t 5000 "Test" "This is a test"

notify-send "Test" --icon=google-chrome --app-name="Google Chrome"