A: You need to install required packages.
In my case:
sudo yum install xfce4-notifyd notification-daemon libnotifydid the job.
Where if you don't have xfce4-notifyd installed, command will execute without error, but no notification will be shown.
Now you can enjoy notifications like this one:
notify-send it\'s\ alive!For inspirational sample messages, see: http://www.thegeekstuff.com/2010/12/ubuntu-notify-send/