Or better yet, let udev trigger do the hard work of watching for you. Just add one line to /etc/udev/rules.d/99-my.rules file: ACTION=="remove", ENV{ID_SERIA

Or better yet, let udev trigger do the hard work of watching for you. Just add one line to /etc/udev/rules.d/99-my.rules file: ACTION=="remove", ENV{ID_SERIAL}=="Pixel_3_0a7...", RUN+="/usr/bin/screensaver-lock-script" To find out your phone's ID_SERIAL string, run this then plug in: udevadm monitor -up