I've been searching all over the place for a solution to this.
How can I show/hide (or minimize/unminimize if you rather) Linux windows.
I'm interested in any solution in any language.
I use Debian, Gnome, Metacity and Compton composite manager if they're relevant
Note: I tried using wmctrl but the toggle,hidden feature of wmctrl has been broken for a while and it's not been updated in two years so unlikely to work any time soon. The net is full of bug reports concerning this.
You can use xdotool:
$ xdotool search --name "Stack Overflo"
24415619
$ xdotool windowminimize 24415619
Basically, you first find a window (by title, by active state etc.), which gives you its ID. Then you invoke commands. There are many ways to find a window, see the manpage.
xdotool is available as a package in at lease Debian, Ubuntu and Fedora.
Note: Shamelessly stolen from this answer: https://superuser.com/questions/186748/how-to-hide-or-minimize-x11-window-from-console