steamcmd

Command-line interface for Valve's Steam

TLDR

Install or update an application anonymously

$ steamcmd +login [anonymous] +app_update [appid] +quit

Install or update an application using the specified credentials

$ steamcmd +login [username] +app_update [appid] +quit

Install an application for a specific platform

$ steamcmd +@sSteamCmdForcePlatformType [windows] +login [anonymous] +app_update [appid] validate +quit

Redirecting stderr to '/home/simon/.steam/logs/stderr.txt'
ILocalize::AddFile() failed to load file "public/steambootstrapper_english.txt".
[  0%] Checking for available update...
[----] Downloading update (0 of 53.847 KB)...
[  0%] Downloading update (1.265 of 53.847 KB)...
[  2%] Downloading update (7.746 of 53.847 KB)...
[ 14%] Downloading update (13.593 of 53.847 KB)...
[ 25%] Downloading update (19.529 of 53.847 KB)...
[ 36%] Downloading update (28.383 of 53.847 KB)...
[ 52%] Downloading update (35.346 of 53.847 KB)...
[ 65%] Downloading update (40.277 of 53.847 KB)...
[ 74%] Downloading update (45.759 of 53.847 KB)...
[ 84%] Downloading update (50.485 of 53.847 KB)...
[ 93%] Downloading update (53.847 of 53.847 KB)...
[100%] Download Complete.
[----] Applying update...
[----] Extracting package...
[----] Extracting package...
[----] Extracting package...
[----] Extracting package...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Cleaning up...
[----] Update complete, launching...
Redirecting stderr to '/home/simon/.steam/logs/stderr.txt'
[  0%] Checking for available updates...
[----] Verifying installation...
[  0%] Downloading update...
[  0%] Checking for available updates...
[----] Download complete.
[----] Extracting package...
[----] Extracting package...
[----] Extracting package...
[----] Extracting package...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Installing update...
[----] Cleaning up...
[----] Update complete, launching Steamcmd...
Redirecting stderr to '/home/simon/.steam/logs/stderr.txt'
[  0%] Checking for available updates...
[----] Verifying installation...
Steam Console Client (c) Valve Corporation - version 1642451655
-- type 'quit' to exit --

Usage: steamcmd ["+COMMAND [ARG]..."]...
  or: steamcmd +runscript SCRIPTFILE

Help topics - type "help " or run with "--help " for more information:

               login : Logging in to Steam
             scripts : Executing a sequence of commands via a script file
         commandline : Executing commands directly via the OS command line
             convars : Options and settings that affect this program session
           app_build : Building Steam application content (only for licensed Steam application developers)
          app_update : Installing/updating a Steam application on the local filesystem (EG dedicated servers)

You can also type "find " to see a list of all commands and convars that contain or reference .