[ActionTanki91]

Use onplayercommandperformed :P if you use zcmd

Код:

public OnPlayerCommandPerformed(playerid, cmdtext[], success)
{
    if(success == 0)
    {
        return SendClientMessage(playerid, YOUR_COLOR, "Unknown command, use /help or /cmds"); // You can change his message.
    }
    return 0;
}