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filter(1)		    Easy Software Products		     filter(1)

NAME
       filter - cups file conversion filter interfaces

SYNOPSIS
       filter job user title num-copies options [ filename ]

DESCRIPTION
       The CUPS filter interface provides a standard method for adding support
       for new document types to CUPS. Each filter is  capable	of  converting
       from  one  or  more  input formats to another format that can either be
       printed directly or piped into another filter to get it to a  printable
       format.

       Filters	must be capable of reading from a filename on the command-line
       or from the standard input, copying the standard input to  a  temporary
       file  as	 required  by  the file format. All output must be sent to the
       standard output.

       The command name (argv[0]) is  set  to  the  name  of  the  destination
       printer.

ENVIRONMENT VARIABLES
       The following environment variables are defined by the CUPS server when
       executing each filter:

       CHARSET
	    The default text character set (typically us-ascii or iso-8859-1).

       CONTENT_TYPE
	    The MIME type associated with  the	file  (e.g.  application/post‐
	    script).

       CUPS_DATADIR
	    The directory where data files can be found.

       CUPS_SERVERROOT
	    The root directory of the server.

       DEVICE_URI
	    The device-uri associated with the printer.

       LANG
	    The default language locale (typically C or en).

       PATH
	    The	 standard execution path for external programs that may be run
	    by the filter.

       PPD
	    The full pathname of the PostScript Printer Description (PPD) file
	    for this printer.

       PRINTER
	    The	 name of the printer; this is provided for shell scripts which
	    may not be able to get the passed argv[0] string.

       RIP_CACHE
	    The recommended amount of memory to use for Raster	Image  Proces‐
	    sors (RIPs).

       SOFTWARE
	    The name and version number of the server (typically CUPS/1.1).

       TZ
	    The timezone of the server.

       USER
	    The user executing the filter (typically lp).

COMPATIBILITY
       While  the  filter  interface  is  compatible  with  System V interface
       scripts, it will only work with the System V interface  script  as  the
       only  filter.   Typically the interface script will be provided via the
       lpadmin(8) command using the -i option.

SEE ALSO
       backend(1), cupsd(8), CUPS Interface Design Description, CUPS  Software
       Administrators  Manual, CUPS Software Programmers Manual, http://local‐
       host:631/documentation.html

COPYRIGHT
       Copyright 1993-2002 by Easy Software Products, All Rights Reserved.

22 June 2000		  Common UNIX Printing System		     filter(1)
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