core.register_chatcommand("shutdown", {
        description = "Shutdown server",
        params = "[delay_in_seconds (non-negative number, or -1 to cancel)] [reconnect] [message]",
        privs = {reboot=true},
        func = function(name, param)
                local delay, reconnect, message = param:match("([^ ][-]?[0-9]+)([^ ]+)(.*)")
                message = message or ""

                if delay ~= "" then
                        delay = tonumber(param) or 0
                else
                        delay = 0
                        core.log("action", name .. " shuts down server")
                        core.chat_send_all("*** Server shutting down (operator request).")
                end
                core.request_shutdown(message:trim(), core.is_yes(reconnect), delay)
        end,
})

minetest.register_privilege("reboot", {
    description = "Can shutdown server",
    give_to_singleplayer = false
})