This is how to skip the Funcom launcher, intro movie, and company logo splashes. You can change the launch options in the steam properties for this game. eval is just a way to run a concatenated command through a subshell. The Windows Steam way will obviously not work.
eval $(echo "%command% -nosplash -nostartupscreen -continuesession" \
| sed -e 's|/Launcher/FuncomLauncher.exe|/DuneSandbox/Binaries/Win64/DuneSandbox_BE.exe|g')
You will need to remove the \ from the above line as Steam will not correctly interpret it.