Server Side Console Commands

How do I add a console commands that can only be run server side?

Why? Because I’d like to add functions that I can run through RCON from my website, but I wouldn’t want them to be accessible by any player.

FCVAR_PROTECTED
FCVAR_SERVER_CAN_EXECUTE

[lua]concommand.Add( “tellall”,
function( ply, cmd, args, fullstring )
for k, v in pairs( player.GetAll() ) do
v:ChatPrint( fullstring )
end
end,

nil, -- autocomplete
nil, -- helptext
bit.bor( FCVAR_PROTECTED, FCVAR_SERVER_CAN_EXECUTE ) -- flags

)[/lua]