Command line

EN

FR

RU

mp

The command line is the operating system command used to launch the game. This can include parameters to adjust how the game runs. All version of OpenTTD support command line options.

Command prompt options

Use openttd [parameter(s)].

Parameter	Description
-h	Lists OpenTTD command options.
-v <driver>	Sets OpenTTD video driver. Depending on your build, valid drivers may include: null for no video (crash) sdl for SDL video win32 for Windows video
-s <driver>	Sets OpenTTD sound driver. Depending on your build, valid drivers may include null for no sound sdl for SDL sound win32 for Windows sound
-m <driver>	Sets OpenTTD music driver. Depending on your build, valid drivers may include null for no music dmusic for DirectMusic win32 for Windows MIDI extmidi for external MIDI bemidi for BeOS MIDI
-r <xres>x<yres>	Sets OpenTTD resolution.
-t <year>	Sets the starting date.
-d <level> -d ai=<level> -d driver=<level> -d grf=<level> -d misc=<level> -d net=<level> -d spritecache=<level>	Sets debug level. Use any number between 0 and 9, where 9 is most sensitive. for AI debuging info only for driver debugging info (sound, music, graphics) for newgrf debugging info only for miscellaneous debugging info for network debugging info only for spritecache debugging info only
-e	Starts the scenario editor.
-g [game]	If no game is specified, starts a new game immediately. If a game is specified, loads that game immediately. Note: -g can load both savegames and scenarios.
-G <seed>	Sets the random seed.
-n [ip:port#player]	Start network game.
-D	Start dedicated server.
-f	Fork into the background (dedicated only).
-c <file>	Use a different config file instead of openttd.cfg

Help for Windows users

There are two ways to add command line parameters:

The shortcut method

• Make a shortcut to openttd.exe
• Right click the shortcut and select properties. The first box should say something like this: C:\Games\openttd.exe
• Put double quotes around the text: "C:\Games\openttd.exe"
• Add parameters afterwards, outside the quotes: "C:\Games\openttd.exe" -m
• To add modifiers, insert them one space after the parameter: "C:\Games\openttd.exe" -n 127.12.13.1
• Separate multiple parameters with spaces: "C:\Games\Openttd.exe" -m -s null
• When you are done, run the game using the shortcut.

The command-line ("DOS") method

• Start cmd.exe (the Windows command prompt). COMMAND.COM (the MS-DOS command prompt) can also be used, but it's more limited.
• Type cd <directory\your openttd.exe\is in\> and press Enter (example: cd C:\Program Files\OpenTTD\).
• Type openttd.exe <-param1 value1 -param2 value2 ... > as above (but without quotes!) and press Enter.