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!mute name|clientnum!unmute name|clientnumYou need g_admin and corresponding admin level. Oh, and RTFM next time.
That's a bit rude. "The manual" (Tremulous 1.1.0 March 17 2006) says nothing about admin commands or mute, and the FAQ (general discussion sticky topic) says that tjw mods adds mute capability, implying that it doesn't even exist on stock servers. If you're going to RTFM someone, at least give a pointer (http://tjw.org/tremulous/ADMIN.txt) if it isn't obvious.
So, you see. Vanilla Trem does not have "Admin-cmds", the ones in there are rcon-cmds, so RTFM is valid Searching the forum for "TJW" or using the link on the start-page of tremulous.net would have brought the solution w/o posting here and waiting for the Answers to drop in.