unhide.rb(8) on Linux
The text 936565b7963d, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 7 (Wheezy) shipped it. The page shows this text now.
Scans system for hidden processes and lists any hits on stderr.