#!/bin/bash
color_scheme=$(gsettings get org.gnome.desktop.interface color-scheme)
case $color_scheme in
*default* ) new_color_scheme="'prefer-dark'";;
* ) new_color_scheme="'default'";;
esac
gsettings set org.gnome.desktop.interface color-scheme "$new_color_scheme"
https://www-users.cse.umn.edu/~arnold/disasters/Patriot-dhar...
https://www.gao.gov/assets/imtec-92-26.pdf