Freedoom is a project to create a complete free-content game based on the Doom engine (often called
“source ports” or simply “ports”), which itself is free software. In addition, it maintains compatibility
with Doom itself and is capable of playing the wide variety of modifications (“mods”) that have been
released by an active community since 1993.
This command is a simple shell script to assist in running Freedoom, which is not a game engine itself
nor part of any engine project, but playing Freedoom should remain simple. The script tries to
automatically select an engine based on a hard-coded list, but three overrides are available, in order of
precedence: command-line argument, environment variable, and a $HOME/.doomport symbolic link. Passing -pDOOMPORT runs Freedoom using the DOOMPORT specified. Setting the DOOMPORT environment variable is
similar, running the engine specified in the variable. An additional permanent setting is via the
$HOME/.doomport symbolic link, which may point to an executable to run.
Additional arguments passed to the program, or after specifying -- as the first option, will be passed to
the engine being called. This can allow you to use options such as -file to load mods or anything else
available with the engine of choice.