# # LPD output filters
APLawrence.com -  Resources for Unix and Linux Systems, Bloggers and the self-employed

Creating LPD Filters

I've removed advertising from most of this site and will eventually clean up the few pages where it remains.

While not terribly expensive to maintain, this does cost me something. If I don't get enough donations to cover that expense, I will be shutting the site down in early 2020.

If you found something useful today, please consider a small donation.

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:

        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:

while (<>) {
  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.

If you found something useful today, please consider a small donation.

Got something to add? Send me email.

(OLDER)    <- More Stuff -> (NEWER)    (NEWEST)   

Printer Friendly Version

-> LPD output filters

Inexpensive and informative Apple related e-books:

Are Your Bits Flipped?

iOS 10: A Take Control Crash Course

Take Control of iCloud

Take Control of Apple Mail, Third Edition

Take Control of Upgrading to El Capitan

More Articles by © Anthony Lawrence

Printer Friendly Version

Have you tried Searching this site?

This is a Unix/Linux resource website. It contains technical articles about Unix, Linux and general computing related subjects, opinion, news, help files, how-to's, tutorials and more.

Contact us

Printer Friendly Version

Write a paper promising salvation, make it a 'structured' something or a 'virtual' something, or 'abstract', 'distributed' or 'higher-order' or 'applicative' and you can almost be certain of having started a new cult. (Edsger W. Dijkstra)

Linux posts

Troubleshooting posts

This post tagged:




Unix/Linux Consultants

Skills Tests

Unix/Linux Book Reviews

My Unix/Linux Troubleshooting Book

This site runs on Linode