Setting the desktop background (wallpaper) in Linux Kodachi Live
 

Does anybody know how to set a custom desktop background programmatically with a bash script?

Right click on desktop then desktop settings.

That is not "programmatically" from a terminal.
I've tried the command "gsettings" which works with other live OS but not with Linux Kodachi.
I would welcome any command or script that could achieve that goal.

So you have a command that works in one Linux-based OS, but not in Kodachi?

Then raise an issue with Kodachi.

If you want to do this in command line find your link to default wall paper.
now link a new one.

More info about your Kodachi setup?
Or are you just waiting for an experienced Kodachi user to chime in?