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From: Tom Parsons <cis@tegan.com>
Subject: Re: lprpp
Date: Sat, 17 Mar 2001 17:07:47 GMT References: <20010317114901.E5769@jpradley.jpr.com>


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Jean-Pierre Radley enscribed:
| In the HPLaserJet interface script, output is piped through
| /usr/lib/lprpp *unless* the -oraw option has been passed to the lp
| command.

| SCO didn't provide the man page for this filter, but it exists on other
| Unix distributions:


|     lprpp
|       This is a filter that converts backspace overstrike to line overprint
|       with horizontal print positioning to enhance bold print.  This
|       functionality is required on printers such as the LaserJet, which
|       cannot produce bold print by overstriking.

|       Options:

|            -i             Converts <ANYCHAR> to <ANYCHAR><BACKSPACE>_ to
|                           italicize ANYCHAR.  Also properly italicizes
|                           overstruck (bold) characters.  Does not work
|                           correctly for "hashed-overstrike" such as
|                           <ANYCHAR><BACKSPACE><DIFFERENTCHAR><BACKSPACE>_.

|            -o             Print only the odd numbered pages.  Used with -e
|                           for double-sided printing.

|            -e             Print only the even numbered pages.  Used with -o
|                           for double sided printing.

|            -lnn           Specifies the page length in lines.  Default is 60
|                           unless -n or -p is selected, in which case it is
|                           66.

|            -n             Specifies nroff mode for printing output of the
|                           nroff command.  Prints 66 lines per page with the
|                           first line appearing on logical line 4 of the
|                           printer.

|            -p             Specifies pr mode for printing output from the pr
|                           command.  Prints 66 lines per page with the first
|                           line appearing on logical line 3 of the printer.



-p doesn't appear in the usage message for lprpp on 5.0.5/5.0.6















| There are some side effects not mentioned in that description:

|       a formfeed character is introduced every 'page lentgh' lines,

|       tabs are converted to spaces,

|       trailing carriage returns are suppressed.

| That last effect bit badly when substituting an HP2100 for an older
| LaserJet.  That printer has no control panel, and does not offer a way
| to make it supply CRs upon seeing LFs; so text that was produced with an
| LF/CR pair by an application reached the printer without the CRs, and
| the text stair-stepped itself clear off the page.

| This can be cured by editing the script not to use the lprpp filter, or
| by piping the final do/done loop through lponlcr.

| One of these days, I *might* play with the possibilities offered by the
| -e/-o options of lprpp. :-)



The -o and -e options appear to print either the odd or even pages in 
a document, then pause the printer while a human refeeds the pages
and then prints the corresponding pages.  Nice tree saver.
-- 
==========================================================================
 Tom Parsons            tom@tegan.com          
==========================================================================    


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