backend(1)
NAME
backend - cups backend transmission interfaces
SYNOPSIS
backend job user title num-copies options [ filename ]
DESCRIPTION
The CUPS backend interface provides a standard method for
sending document files to different physical interfaces.
Backends must be capable of reading from a filename on the
command-line or from the standard input, copying the stan
dard input to a temporary file if required by the physical
interface.
The command name (argv[0]) is set to the device URI of the
destination printer.
ENVIRONMENT VARIABLES
The following environment variables are defined by the
CUPS server when executing the backend:
- 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. applica
tion/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; this is
provided for shell scripts which may not be able to
get the passed argv[0] string. - LANG
- The default language locale (typically C or en).
- PATH
- The standard execution path for external programs
that may be run by the backend. - PPD
- The full pathname of the PostScript Printer Descrip
tion (PPD) file for this printer. - PRINTER
- The name of the printer.
- 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 backend, typically root; con
sult the cupsd.conf file for the current setting.
SEE ALSO
cupsd(8), filter(1) CUPS Interface Design Description,
CUPS Software Administrators Manual, CUPS Software Pro
grammers Manual, http://localhost:631/documentation.html
COPYRIGHT
- Copyright 1993-2003 by Easy Software Products, All Rights
Reserved.