A.P. Lawrence

man page for lprpp

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From: Jean-Pierre Radley <jpr@jpr.com>
Subject: Re: lprpp
Date: Sat, 17 Mar 2001 17:41:15 GMT References: <20010317114901.E5769@jpradley.jpr.com>

Jean-Pierre Radley propounded (on Sat, Mar 17, 2001 at 04:49:01PM +0000):
| In the HPLaserJet interface script, output is piped through
| /usr/lib/lprpp *unless* the -oraw option has been passed to the lp
| command.
| 

...

| 
| 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.

I should add:
If a unix text file is printed using this interface script, there is no
stair-stepping, because before opening any input material, the script
sends the PCL command '\033&k2G', which tells the printer to interpret
LF as CR/LF.  BUT: the application I was testing this with, filepro,
starts off any output with '\033E', which has the effect of negating that
line-termination instruction.

-- 
JP

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