backend(1) Easy Software Products backend(1)
backend - cups backend transmission interfaces
backend job user title num-copies options [ filename ]
The CUPS backend interface provides a standard method for sending docu-
ment 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) is set to the device URI of the destination
printer. Starting with CUPS 1.1.22, any authentication information in
argv will be removed, so backend developers are urged to use the
DEVICE_URI environment variable whenever authentication information is
The following environment variables are defined by the CUPS server when
executing the backend:
The default text character set (typically us-ascii or iso-8859-1).
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.
The MIME type associated with the file (e.g. applica-
The directory where data files can be found.
The root directory of the server.
The device-uri associated with the printer; this is provided for
shell scripts which may not be able to get the passed argv
string and for backends that require any authentication informa-
tion which is not included in argv.
The default language locale (typically C or en).
The standard execution path for external programs that may be run
by the backend.
The full pathname of the PostScript Printer Description (PPD) file
for this printer.
The name of the printer.
The recommended amount of memory to use for Raster Image Proces-
The name and version number of the server (typically CUPS/1.1).
The timezone of the server.
The user executing the backend, typically root; consult the
cupsd.conf file for the current setting.
cupsd(8), filter(1) CUPS Interface Design Description, CUPS Software
Administrators Manual, CUPS Software Programmers Manual, http://local-
Copyright 1993-2005 by Easy Software Products, All Rights Reserved.
8 October 2004 Common UNIX Printing System backend(1)
Man(1) output converted with