Factorio Runtime DocsVersion 1.1.100

This will register a custom event called print_tick that prints the current tick to either the player issuing the command or to everyone on the server, depending on the command parameter. It shows the usage of the table that gets passed to any function handling a custom command. This specific example makes use of the tick and the optional player_index and parameter fields. The user is supposed to either call it without any parameter ("/print_tick") or with the "me" parameter ("/print_tick me").

commands.add_command("print_tick", nil, function(command)
  if command.player_index ~= nil and command.parameter == "me" then
    game.get_player(command.player_index).print(command.tick)
  else
    game.print(command.tick)
  end
end)