Garry's Mod Wiki

Command Line Parameters

A full list of Source command-line options can be found here.

Garry's Mod-Specific Commands

Command Line Description
-noaddons Temporarily disables folder/legacy addons
-noworkshop Temporarily disables Steam Workshop addons
-disableluarefresh Disables Auto Refresh
-multirun Allows you to launch multiple instances of the game. You will not be able to connect to the same multiplayer server from both instances, unless the server has sv_lan set to 1.

Please note that the sv_lan 1 command must be set before the server is started or a changelevel is required.
server.cfg will not work, as it is ran too late!
-nochromium If on a Beta branch that runs Chromium, disables Chromium.
-allowlocalhttp Allows local IP links (192.168.x.x) to be used with the http functions. This only works on the server.
-fullwindowsdump Generates more detailed crash dumps on Windows.
-language Overrides Steam's language setting for the primary game language, which controls captions and engine panels.
+<ConVar name> <value> Sets value of a console variable after the game is started.
-systemtest Spawns one bot by default and loads the includes/dev_server_test.lua file. This also allows you to use engine.CloseServer
Note about -systemtest
If you try to join a Singleplayer game while this is enabled, you cannot connect because Server is full. (The bot is added before you join.)

Setting up Command Line Parameters in Steam

To set Command Line Parameters (Launch Options) in Steam for Garry's Mod:

  • Open your Steam Library and right click on Garry's Mod and click Properties
  • In the pop up window press Set Launch Options...
  • A new pop up window will appear, where you can enter your desired Launch Options, separated by space
  • After you are done, press OK and then Close and you are done