Force always Duplex printing

[Anonymous]

> Anonymous wrote:
> >
> > I have a HP Laserjet 4000 and I have configured two postscript printer spools, one for one side printing and the other for two sides printing. I would force to print one or two sides every file sent to the spools.
> > My problem is that cups doesn't force Duplex printing if it finds this setting in the postscript file, it always do what is in the file.
> > I don't want the user to set this option from the driver nor from a command line argument.
> > Do you know this is already possible?
> > I tried many changes in ppd files and I checked the foomatic-rip debug but I couldn't find out how to do.
> >
> > Riccardo
>
> Add the following to your printer's PPD:
> ---snip---
> *JobPatchFile 1: "% force duplex
>   <</Duplex true>>setpagedevice
>   /_orig_setpagedevice /setpagedevice load def
>   /setpagedevice
>   {
>     dup /Duplex undef % trash any duplex setting
>     dup /Tumble undef % trash any tumble setting
>     _orig_setpagedevice
>   }bind def"
> ---snip---
> Add this around where the "Device Capabilities" are listed.
> It will force duplex printing and inhibit any subsequent
> modification of this key.
>
> Helge
>
> --
> Helge Blischke
> Softwareentwicklung
> SRZ Berlin | Firmengruppe besscom
> http://www.srz.de
> tel: +49 30 75301-360
Great, thanks, it works!
Could you tell me the same command to force no Duplex printing?
Thanks in advance

Riccardo