-clearbeta
This option lets you opt out of beta participations. Beta participations allow you to get some content beforehand but it may contain some bugs and it is also updated regularly to fix them.

-console
This option enables the Steam debug console tab. It can help users debug the problem and fix it. It is mostly used by advanced users.


-complete_install_via_http
This options runs the installation completion over HTTP by default.

-ccsyntax
This spews details about the localized strings we load.

-debug_steamapi
Enables logging of Steam API functions

-developer
This function sets the developer variable in the client to “1”. It can also be used to launch the VGUI editor and the VGUI zoo by pressing the keys F6 and F7 respectively. It is also intended for developing skins.

-fs_log
This logs file system accesses.

-fs_target
It sets the target syntax.

-fs_logbins
This command logs the binaries we load during the operation.

-forceservice
This command forces the Steam client to run even if Steam has administrator privileges.

-gameoverlayinject
This command lets you set the method on how the GameOverlay is injected.

-language <language>
This sets your Steam language to the one you specify in the <language> such as German or English. You can write “german” in the language place in <language>.

-noasync
This disables the async files operations. Instead, it tells the client to use the synchronous ones instead.

-nocache
This starts Steam without its cache (it doesn’t access its cache folder). Note that Steam must off for this to work.

-noverifyfiles
This prevents the Steam client from verifying the integrity of files. This comes in handy when you are testing localization.

-no-browser
Change the old UI friendlist.


-no-dwrite
This forces the vgui to use GDI text even if there is a support for DWrite available.

-script <name>
This runs a Steam script already stored in the Steam directory. All the scripts must be in a subdirectory of the main Steam’s folder. They are called test scripts. Steam must also be off for this to work.

-shutdown
This forcefully closes steam and shuts it down.

-silent
This helps suppress the dialogue box that opens automatically when you start Steam. This is mostly used when you have Steam set to auto-start when you turn on your computer.

-single_core
This forces Steam to run and consume your primary CPU only and leave the others vacant.

-tcp
This forces Steam’s connection backend to be via TCP.

-tenfoot
This starts Steam in the Big picture mode so it covers your entire screen.