# LPRng Reference Manual

## 24 Sep 2004 (For LPRng-3.8.28)

### Patrick A Powell

`<papowell@lprng.com>`
AStArt Technologies
6741 Convoy Court,
San Diego, CA 92111
Phone 858-874-6543
Fax 858-751-2435

Copyright © 1996-2001 Patrick Powell

The LPRng; Printing Software consists of the LPRng print spooler, the ifhp print filter, and the LPRngTool graphical user interface.

The LPRng print spooler is an enhanced, extended, and portable implementation of the Berkeley lpr print spooler functionality. While providing the same interface and meeting RFC1179 requirements, the implementation is completely independent and provides support for the following features: lightweight (no databases needed) lpr, lpc, and lprm programs; dynamic redirection of print queues; printer pooling and load balancing; automatic job holding; highly verbose diagnostics; client programs do not need to run SETUID root; greatly enhanced security checks; load balancing across multiple printers; and a greatly improved permission and authorization mechanism. The source software compiles and runs on a wide variety of UNIX systems, and is compatible with other print spoolers and network printers that use the lpr interface and meet RFC1179 requirements. Included in the LPRng print spooler distribution is a set of customizable banner page generation programs.

The SVR4 lp and lpstat functionality is provided by a set of emulator programs, and LPRng can be easily integrated with the Samba SMB support package. For users that require secure and/or authenticated printing support, LPRng supports SSL (using OpenSSL), Kerberos 5, MIT Kerberos 4 extensions to LPR, PGP, and simple MD5 based authentication. Additional authentication support is extremely simple to add.

The ifhp print filter converts print jobs into formats compatible with PostScript, PCL, text, and other printers and provides diagnostic and error information as well as accounting information.

The ;LPRngTool& Graphical User Interface provides a simple to use configuration and monitoring tool. It allows users to monitor printers and generate printcap entries in a simple manner, as well as providing extensive help and diagnostics.

> Important: THIS DOCUMENTATION AND THE DESCRIBED SOFTWARE IS PROVIDED BY THE AUTHORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

List of Tables
4-1. Filter Options
4-2. Job Formats and Filter Selection
4-3. :ifhp= Options
11-1. Network Print Server Configuration Information
13-1. Control File Lines
16-1. Print Filter Command Line Options
16-2. Filter Command Line Options and Values
16-3. Filter Command Line Option Format
16-4. Filter Environment Variables
17-1. Permission Keywords and Purpose
19-1. RFC1179 Commands
19-2. Control File Lines and Purpose
19-3. LPC Commands
A-1. LPRng Options

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