Umm... What exactly is your issue? Are you trying to run this command? Because that looks incredibly fishy.
If you're trying to run that with malicious intent, I have no intention of helping. If you're seeing this in your console, your server seems to be compromised, and you should shut it down and do damage control immediately to determine the cause.
Check everything—lua, addons, etc. Your client, even. Do a fresh install of Garry's Mod dedicated server and make sure something deeper isn't compromised. Make sure to change your rcon password, or disable it if it isn't essential.