Header and trailer page pipelines

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The sh attribute is used to define the pipeline for header and trailer pages.

Below is the sh attribute used to define the pipeline for header page generation and printing for an extended ASCII queue on an IBM® 4029 LaserPrinter. The attribute is shown as formatted by the lsvirprt command. See Virtual printer definitions for a further explanation.

Pipeline for Header Page
sh = %Ide/pioburst %F[H] %Idb/H.ascii | %Ide/pioformat 
-@%Idd/%Imm -!%Idf/piof52
02 -L! -J! %IsH -u%IuH
 %Ide          INCLUDE: (Directory Containing Miscellaneous 
Modules)
 '/pioburst '
 %F[H]         If "-H] Argument" on Command Line, "-# Argument" 
-> OUTPUT
 ' '
 %Idb          INCLUDE: (Directory Containing Header and Trailer 
Text Files)
 '/H.ascii | '
 %Ide          INCLUDE: (Directory Containing Miscellaneous 
Modules)
 '/pioformat -@'
 %Idd          INCLUDE: (Directory Containing Digested Data Base 
Files)
 '/'
 %Imm          INCLUDE: (File Name Of (Digested) Data Base; Init.
By
               "piodigest" (mt.md.mn.mq:mv))
 ' -!'
 %Idf          INCLUDE: (Directory Containing Loadable Formatter 
Routines)
 '/piof5202 -L! -J! '
 %IsH          INCLUDE: (FORMATTING FLAGS for header page)
 ' -u'
 %IuH          INCLUDE: (Input PAPER TRAY for header page)

During spooler job processing, the value of the sh attribute is determined to be:

/usr/lib/lpd/pio/etc/pioburst /usr/lib/lpd/pio/burst/H.ascii | 
/usr/lib/lpd/pio/etc/pioformat 
-@/var/spool/lpd/pio/@local/ddi/ibm4029.asc.lp1.asc:lp1 
-!/usr/lib/lpd/pio/fmtrs/piof5202 -L! -J! -u1

The pioburstcommand processes the header page template and pipes its output to the device-independent formatter, pioformat, which in turn loads the digested version of the colon file for this virtual printer (the argument to the -@ flag) and the device-dependent formatter, piof5202 (the argument to the -! flag). There are three flags to piof5202:

  1. -L! - Long lines should not be wrapped.
  2. -J! - The printer should be restored to the state it was in before the header page was printed.
  3. -u1 - The header page should be drawn from paper tray 1.

The value of the st definition is similar to the value of the sh definition.