psmandup(1) on Linux
The text f2b243fda5c3, as Debian 10 (Buster) shipped it.
print duplex on non duplex printers
Flags it lists
-
--back -
--front -
--help -
--no-fix -
--output -
--quiet -
--version -
-b -
-f -
-h -
-n -
-o -
-q -
-v