[Bacardi]

Those commands:
rcon = is remote control, you can send commands into SRCDS console from your game.
You need first use rcon_password before you can use.

con_logfile file = it start create log file from SRCDS console screen.
differences = list all cvars which are not default values.

and last command should stop log.

You should get file in your server files "mydifferences.log"