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Command Line Parameters

This pages describes commonly useful and Garry's Mod exclusive command line parameters, also known as "Launch Parameters" in Steam.

Garry's Mod specific parameters

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.
-systemtest Spawns one bot by default and loads the includes/dev_server_test.lua file. This also allows you to use engine.CloseServer
-allowquit See engine.CloseServer for more info
-disablehttp Disables HTTP and other related functions.
-noconclr Disables color support entirely for dedicated server console, both Windows and Linux. Can be used to avoid unwanted ANSI Escape Sequences in output and similar issues with archaic software.
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.)

Useful parameters from base Source Engine

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

Command Line Description
+<ConVar Name> <value> Sets ConVar of a console variable after the game is started.
-tickrate <value> Sets the target tick rate for the server (Dedicated and listen server/singleplayer alike). Recommended value range is 30-128. Default is 66.6666.

Configuring Steam

You can set Garry's Mod's launch options with the following steps:

  1. Open your Library in the Steam client

  2. Open the context menu of Garry's Mod with  rmb

  3. Click on Properties to open the settings menu

  4. Under Launch Options set your desired configuration

  5. Simply close the menu to save your changes

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