i3lock(1) on Linux
The text 28d2affc66d1, as Debian 7 (Wheezy) shipped it.
improved screen locker
Flags it lists
-
--beep -
--color -
--dpms -
--image -
--no-unlock-indicator -
--nofork -
--pointer -
--tiling -
--version -
-b -
-c -
-d -
-i -
-n -
-p -
-t -
-u -
-v