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Linux and UNIX Man Pages

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RedHat 9 (Linux i386) - man page for filter (redhat section 1)

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 convert- ing 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 print- able 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 tempo- rary 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). CLASS When a job is submitted to a printer class, contains the name of the destination printer class. Otherwise this environment variable will not be set. CONTENT_TYPE The MIME type associated with the file (e.g. application/postscript). 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 Processors (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://localhost: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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