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In Kubuntu 16.04, I can set the opacity for an application's active window using the system's GUI:

Active Opacity

But is there a way to do so using a command that can accessed via a script (and a keyboard shortcut)?

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Using the keyboard

It's possible to use the keyboard to decrease or increase the opacity of the active window by increments of 5%.

To do so, open System Settings > Global Shortcuts > KWin. In the Action column, find Decrease Opacity of Active Window by 5% and Increase Opacity of Active Window by 5%. Set appropriate keyboard shortcuts for each of the actions and click Apply. That's it.

Decrease/Increase Active Window Opacity

Using the mouse wheel

If one prefers, there's a option using the mouse wheel. Open System Settings > Window Management > Window Behavior and click on the Window Actions tab.

In the section titled Inner Window, Titlebar & Frame, click on the dropdown next to Mouse wheel and choose Change Opacity. Then click Apply.
Note: you have a choice of Alt or Meta (aka Super) as the modifier key.

Using the mouse wheel

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