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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 document files to dif-
ferent physical interfaces.
Backends must be capable of reading from a filename on the command-line or from the stan-
dard input, copying the standard input to a temporary file if required by the physical
The command name (argv) is set to the device URI of the destination printer.
The following environment variables are defined by the CUPS server when executing the
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. application/postscript).
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.
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 Processors (RIPs).
The name and version number of the server (typically CUPS/1.1).
The timezone of the server.
The user executing the backend (typically lp).
cupsd(8), filter(1) CUPS Interface Design Description, CUPS Software Administrators Man-
ual, CUPS Software Programmers Manual, http://localhost:631/documentation.html
Copyright 1993-2002 by Easy Software Products, All Rights Reserved.
22 June 2000 Common UNIX Printing System backend(1)
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