I copied a *.colors file to ~/.kde/share/apps/color-schemes/

How do I a programmatically make KDE use the new color scheme?

Very old thread, but I encountered the same problem. There is some more info in here: https://www.reddit.com/r/kde/comments/8 ... _terminal/

But the advised method is still rather tedious as it probably leads to creating a script.

At least for Konsole you can do it with a single command: https://www.reddit.com/r/kde/comments/f ... or_scheme/

On writing KDE configs, this is a nice elaborate example: https://github.com/shalva97/kde-configu ... upKDE.fish