Create instant desktop notification linux

Question

I'm writing a program which notify user about something repeatedly with new message each time using notify-send, but the problem is I want notifications to stay there for 5 seconds but it should be removed or deleted whenever new notification is created from notify-send.

Answer 1

notify-send does take a -t argument for time:

-t, --expire-time=TIME
Specifies the timeout in milliseconds at which to expire the notification.

But you're at the mercy of whatever handles the notifications as to whether or not that's implemented.

I tried it on KDE with notify-send -t 5000 test and the notification was on the screen for only three seconds. This may work in Ubuntu proper with notify-osd but it may not. If you want to be certain, you'll have to implement your own notification system.