vfeedback(6x) on Linux
The text 8454a41490ef, as Debian 12 (Bookworm) shipped it.
Simulates video feedback.
Flags it lists
-
--darken -
--fps -
--no-fps -
--noise -
--root -
--tv-brightness -
--tv-color -
--tv-contrast -
--tv-tint -
--visual -
--window -
--window-id