Roblox admin commands by userid script

-- Admin commands for YOUR game. Only the UserIds in the list can use them.
-- Type in chat:  !kill name   !heal name   !speed name 50   !kick name

-- Replace 0 with your Roblox UserId. Add more lines for helpers you trust.
-- Always use the UserId, never the username. Usernames can be changed.
local ADMINS = {
	[0] = true,
}
local PREFIX = "!"

local Players = game:GetService("Players")

-- Finds a player whose name starts with what you typed (not case sensitive).
local function findPlayer(query)
	if not query then
		return nil
	end
	query = string.lower(query)
	for _, player in Players:GetPlayers() do
		if string.sub(string.lower(player.Name), 1, #query) == query then
			return player
		end
	end
	return nil
end

local function getHumanoid(player)
	local character = player.Character
	return character and character:FindFirstChildOfClass("Humanoid")
end

local commands = {}

commands.kill = function(admin, args)
	local target = findPlayer(args[2])
	local humanoid = target and getHumanoid(target)
	if humanoid then
		humanoid.Health = 0
	end
end

commands.heal = function(admin, args)
	local target = findPlayer(args[2])
	local humanoid = target and getHumanoid(target)
	if humanoid then
		humanoid.Health = humanoid.MaxHealth
	end
end

commands.speed = function(admin, args)
	local target = findPlayer(args[2])
	local humanoid = target and getHumanoid(target)
	local speed = tonumber(args[3])
	if humanoid and speed then
		humanoid.WalkSpeed = math.clamp(speed, 0, 100)
	end
end

commands.kick = function(admin, args)
	local target = findPlayer(args[2])
	if target and target ~= admin then
		target:Kick("You were removed by the game admin.")
	end
end

local function onChatted(player, message)
	if not ADMINS[player.UserId] then
		return -- not an admin: ignore silently
	end
	if string.sub(message, 1, #PREFIX) ~= PREFIX then
		return
	end

	local args = string.split(string.sub(message, #PREFIX + 1), " ")
	local command = commands[string.lower(args[1] or "")]
	if command then
		command(player, args)
	end
end

local function onPlayerAdded(player)
	player.Chatted:Connect(function(message)
		onChatted(player, message)
	end)
end

Players.PlayerAdded:Connect(onPlayerAdded)
for _, player in Players:GetPlayers() do
	onPlayerAdded(player)
end