Is there a command that can change the default apps?
I mean specifically this setting:
Changed the association from Photo Viewer to gThumb. But I’d like to do this via a command as well to automate it during system (re-) installs.
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I think gsettings or dconf would be the way to script this 
, which is how you would do Shortcuts as well in dconf.
Just checked dconf editor and could not find it. So i assume it’s gonna have to be gsettings.
edit :
I had better success with :
xdg-mime query default
application/ audio/ font/ image/ message/ model/ multipart/ text/ video/
which for example returned :
xdg-mime query default video/mp4
org.videolan.VLC.desktop
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Yes but that is not what I meant. I know I can use xdg-mime to change the default application per file-type.
What I am referring to is a command to change the default application for an entire category of file types such as images/photos.
I already did dconf watch / while changing the setting in my screenshot, but nothing appeared so indeed no gsettings/dconf solution will work.
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Take a look to ~/.config/mimeapps.list
At least when I set Chrome as Default Web App, in such file I get
...
x-scheme-handler/https=com.google.Chrome.desktop
...
When I switch back to Firefox, I get
...
x-scheme-handler/https=org.mozilla.firefox.desktop
...
More info: Override the default registered application for individual users
Edit. Hint: explore gio command
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