duplex is an option in the configuration file,
not on the command line.

i remember struggling with duplex years ago, i believe there are (where?) several ways to specify duplex to postscript printers and the printer we had at work was an uncommon one.

good luck

-Steve


On 18 Sep 2026, at 6:50 am, me via 9fans <[email protected]> wrote:


I want to clarify that I meant `lp -i duplex /sys/doc/lp.ps`. I ran the command and I got "illegal option '-i duplex' ignored". I have read the manual and it says that `lp` accepts the `duplex` option. I don't understand what is going on.

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