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Creating LPD Filters


Some material is very old and may be incorrect today

© February 2008 Anthony Lawrence

There really should be no reason you'd need to do this on any modern Linux, but I had a client with an old RedHat 7.0 system who wanted to control the output to a laser printer, specifically to make it print Landscape orientation. Hard to believe, but "printtool" on that version provided no such option.

If you look at /etc/printcap on such a system, you'll find that the "if" points to the "filter" script in the /var/spool/lpd/printername directory. That in turn is a symbolic link to a filter. You can replace that filter with your own.

Again, ordinarily you would never want to do that, especially on more modern Linuxes.

To replace it, first cd to /var/spool/lpd/printername and then "rm filter". That's important; if you don't rm it, you'll be writing over the systems filter. I replaced it with this:


#!/bin/bash
(
        pagelen="45";
        lmargin=6;
        echo -e "\033E\c"	# Reset printer.
        echo -e "\033&l1O\c"    # landscape
        echo -e "\033&l${pagelen}P\c"
        echo -e "\033&a${lmargin}L\c"
        echo -e "\033&k2S\c"   #compressed
        cat -
) | /usr/bin/crnl
 

I also created /usr/bin/crnl, which is just:

#!/usr/bin/perl
while (<>) {
  chomp;
  print "$_\r\n";
}
 

And that's another script you wouldn't need on any modern Linux because your printer creation tool has adding CR's as an option.

So: ancient stuff, pay no attention to any of this nowadays. Put here just to help out someone stuck with an old system.


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