My admin script for roblox dev server

-- Admin script made by spicychilly2
-- when this script is ran everyone who joins will get admin

-- use commands: !speed (amount) and !reset and !kickmyself

local prefix = "!" -- this is the prefix

game.Players.PlayerAdded:Connect(function(plr) -- Fires when someone joins the game
    plr.Chatted:connect(function(msg) -- Fires if player that joined has chatted
        if string.match(msg, prefix) then -- if player's message has the prefix in it this will fire
            if string.match(msg, prefix.."speed") then  -- fires if player is trying to do the !speed command
                local amount = tonumber(msg:sub(string.len(prefix.."speed") + 2)) -- gets the amount of speed that hat player added in the command
                plr.Character.Humanoid.WalkSpeed = amount -- setting player's walkspeed to the amount they chose
                print("Set "..plr.Name.."'s speed to "..amount..".")
            end

            if string.match(msg, prefix.."reset") then
                plr.Character.Humanoid.Health = 0
            end

            if string.match(msg, prefix.."kickmyself") then
                plr:Kick("You kicked yurself!")
            end
        end
    end)
end)