Comands script?

How would i make a script when I say a certain word something happens? EX: I say "Kill" Then it would kill all the players alive or just me.

local commands = {
	["kill"] = function()
		for _, p in pairs(game.Players:GetPlayers()) do
			if p.Character then
				p.Character:BreakJoints()
			end
		end
	end;
}

game.Players.PlayerAdded:connect(function(player)
	player.Chatted:connect(function(msg)
		if commands[msg:lower()] then
			commands[msg:lower()]()
		end
	end)
end)