Virtual printer filter flag attributes

Attributes grouped under the _ _FIL group header attribute store command strings for text filter flags.

The first character of the attribute name is always f and the second character denotes the type of filter. Filter flags, such as -p and -n specify to the backend program the type of filter used to format the print job. Filter attribute designations are:

Item	Descriptor
`fp`	pr filter
`fn`	Formats files containing ditroff (device-independent troff) data
`fl`	Prints control characters and suppresses page breaks
`ft`	Formats files containing data produced with troff commands
`fd`	DVI filter formats files created with tex
`fg`	Formats standard plot data files (files created with plot)
`fv`	Formats raster image files
`fc`	Formats files containing data produced with cifplot
`ff`	Interprets the first character of each line as a FORTRAN carriage control character.
`fb`	Determines the locale support for Arabic and Hebrew. Must be /usr/bin/bprt. The width must be set to 80 and the data stream set to a for extended ASCII. Add the flag - tashkeel to print documents with diacritics.

The value stored in a filter attribute designates the command string for the specified filter. Entries for a supported PostScript laser printer can include:

_ _FIL COMMAND STRINGS FOR FILTER FLAGS (2 char,
         1st="f",2nd=flag)

fn     Command String for the "n" Filter.             /usr/bin/psc
                                                      %is
fp     Command String for the "p" Filter              /bin/pr -l%G_l
                                                      %d -w%G_w%d%F[
                                                      h] %I@1%ia
fb     Command String for the "b" Filter.             /usr/bin/bprt
                                                      -w%I_w -d%I_d
                                                      -tashkeel

These same attribute values are stored in the colon file as follows:

:055:_ _FIL::
:269:fn::/usr/bin/psc%is
:270:fp::/bin/pr -l%G_l%d -w%G_w%d%F[h] %I@1%ia

The fd attribute is a typical filter attribute. It is used to specify a DVI filter for the virtual printer. Use SMIT or the chvirprt command to specify this filter. For example, to specify a DVI filter by using SMIT, enter:

smit lsvirprt

Select the desired virtual printer and enter the following:

fd=/usr/bin/dvi_to_printer%ip

where dvi_to_printer specifies the full pathname of the filter that converts the DVI output from tex to the format expected by the printer. The %ip designation forces the pass-through pipeline (the ip attribute) to be used to process the print file instead of the ASCII pipeline (ia attribute). The pass-through pipeline causes the output from the filter to be passed to the printer unmodified.

After the DVI filter has been specified in the fd attribute, you can send a print command such as lpr -d DviFile or qprt -fd DviFile. The -d and -fd flags for the respective commands pass DviFile, an output file produced by tex, through the DVI filter and send the results to the printer.