If you're part of a Skype group chat you're often annoyed by too many messages that are exchanged in the chat. Every message triggers a notification which may be really annoying. There are 2 ways of getting rid of them - to hide behind a "Do not disturb" status which will suppress the notifications (along with preventing some other people from whom you'd rather want to receive a message from writing to you) or to simply disable the group chat notifications for a particular chat. In the Windows and Mac Skype clients there is an option in GUI to disable chat notifications, and there is none for the Linux client.
in any chat window, be it a group chat or a personal chat, issue the following command:
That's it =) (Resembles IRC commands, doesn't it?)
Actually there are more commands - you can find them all in this article, for instance. The most useful one for me, though, is above =)