notify-send

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

• Show a notification with the title "Test" and the content "This is a test":

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

• Show a notification with a custom icon:

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

• Show a notification for 5 seconds:

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

• Show a notification with an app's icon and name:

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