Reference

ppdfilt(1) on Linux

The text a00a34c0c3de, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it. The page shows this text now.

insert printer specific code into a PS job.

Flags it lists

ppdfilt(1) on Linux now