How to start gog installed game from command line?

Something like ./wine '\home\user\snap\gog-galaxy-wine\common\.wine\drive_c\Program Files (x86)\GOG Galaxy\Games\Arcanum\Arcanum.exe'

It really depends. And I'm rusty as hell on my Ubuntu. But the right kind of file manager can just drop open a terminal in the folder to make your life easier.

Don't forget about tabbing to autocomplete.

Addendum: Also, there's things like Lutris.

I don't have any game installed on this machine, as I'm at work, so I can't check myself, but take a look at the "start.sh" script for a game running under Wine. That should either run the game directly through wine (in which case you have the command line right in there), or point to another script in the game's "game" directory.

Every GOG game has the start.sh script, and that is what the menu or desktop icons point to.

The easiest way to start any GOG game from the command line is to just run start.sh. You only need to dig deeper if there's a reason to not run said script.

...and just forget about Galaxy as it only complicates matters on Wine.

I do not know if I will be able to help you, but when I want to run a windows game in Ubuntu, I usually follow this steps:
1.- I check if there are some scripts to run this game in Ubuntu. You have ./play.it (https://www.gog.com/forum/general/linux_playit_weekly_news/post1) and Adamhm's Linux Wine Wrappers (https://www.gog.com/forum/general/adamhms_linux_wine_wrappers_news_faq_discussion/post1).
2.- If I cannot find this game in both places, I try to use PlayOnLinux. This program is available in Ubuntu it is usually straightforward. I usually check in WineHQ (https://www.winehq.org/) if the game is compatible with Wine and the solutions.
3.- You can try as well Lutris (https://lutris.net/). I have never tried it but it looks like very promising

Best regards,
Luis :-)

P.S. I do not use command line, so I cannot hep you with that.( I do not know the reason why you prefer to use command line)

not sure how things work in Ubuntu, ./"path/to/file.exe" works in my distro. assuming you want to use NVIDIA proprietary graphics (primusrun / the equivalent of that in Ubuntu) before the previous command should be enough.

what have you tried that doesnt work?