This doesn't exist in CraftBukkit, doesn't it? There's a plugin called Unknown Command that gives you an unknown command.
IVE DONE IT, CREATED THE MASTER PLUGIN OF ALL POINTLESS PLUGINS, here lol: http://forums.bukkit.org/threads/fun-beanz-v1-remove-those-beanz-commands-766.17521
Juze: Well in this case .. you just want to have a plugin that tells you "This command doesn't exists" ? Well .. this can be done through player.performCommand("yourcommand") and its return value is boolean. If the command does not exists or its syntax was wrong it will output your defined message. You just have to check against "if (!(sender instanceof Player)) { sender.sendMessage("This feature is not vailable in CONSOLE")); }" to prevent an Exception thrown when called from ConsoleCommandSender This is done in onCommand. Just register a bogus command like /unknowncommand and you are fine =) Sry Juze for tagging you. I totally missed the context.
