backend - phpMan

backend(1)                  Easy Software Products                  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 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.
       Starting  with  CUPS  1.1.22,  any  authentication  information  in argv[0] will be
       removed, so backend developers are urged to use the DEVICE_URI environment variable
       whenever authentication information is required.

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  destina-
            tion 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 and for  backends  that
            require any authentication information which is not included in argv[0].

       LANG
            The default language locale (typically C or en).

       PATH
            The standard execution path for external programs that may be run by the back-
            end.

       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.

SEE ALSO
       cupsd(8), filter(1) CUPS Interface Design Description, CUPS Software Administrators
       Manual, CUPS Software Programmers Manual, http://localhost:631/documentation.html

COPYRIGHT
       Copyright 1993-2005 by Easy Software Products, All Rights Reserved.



8 October 2004            Common UNIX Printing System               backend(1)

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