backend

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 standard 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. 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; 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 Description (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; consult the cupsd.conf file for the current setting.

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