IW4x

Argument	Description
`-tests`	Perform unit tests.
`-entries`	Print to the console a list of every asset as they are loaded from zonefiles.
`-stdout`	Redirect all logging output to the terminal iw4x is started from, or if there is none, creates a new terminal window to write log information in.
`-console`	Allow the game to display its own separate interactive console window.
`-dedicated`	Starts the game as a headless dedicated server.
`-bigminidumps`	Include all code sections from loaded modules in the dump.
`-reallybigminidumps`	Include data sections from all loaded modules in the dump.
`-dump`	Write info of loaded assets to the raw folder as they are being loaded.
`-nointro`	Skip game's cinematic intro.
`-version`	Print IW4x build info on startup.
`-nosteam`	Disable friends feature and do not update Steam about the game's current status just like an invisible mode.
`-unprotect-dvars`	Allow the server to modify saved/archive dvars.
`-zonebuilder`	Start the interactive zonebuilder tool console instead of starting the game.
`-disable-notifies`	Disable "Anti-CFG" checks
`-disable-mongoose`	Disable Mongoose HTTP server
`-disable-rate-limit-check`	Disable RCOn rate limit checks
`+<command>`	Execute game command (ex. `+set net_port 1337`)

S1-Mod, IW6-Mod

Argument	Description
`-headless`	Use system console
`-dedicated`	Dedicated server
`-singleplayer`	Start singleplayer; Skip launcher
`-multiplayer`	Start multiplayer; Skip launcher
`+<command>`	Execute game command (ex. `+set net_port 1337`)