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Online Help

This is the CUPS online help interface. Enter search words above or click on any of the documentation links to display online help information.

If you are new to CUPS, read the "Overview of CUPS" page. Veteran users should read the "What's New in CUPS 1.4" page.

The CUPS home page also provides many resources including user discussion forums, answers to frequently-asked questions, and a form for submitting bug reports and feature requests.

What's New in CUPS 1.5

CUPS 1.5 many changes and new features to CUPS 1.4.x. This page provides a high-level outline of these changes. If you have never used CUPS before, read the "Overview of CUPS" document instead.

Commands

1. User defaults; Starting in CUPS 1.2, user defaults were stored in the ~/.cups directory, and the old ~/.cupsrc and ~/.lpoptions files were deprecated. Support for ~/.cupsrc and ~/.lpoptions have been removed in CUPS 1.5.
2. IPP test tool; The ipptool IPP test tool is now a first-class user program.
3. lpadmin; The lpadmin command now supports setting the cupsIPPSupplies and cupsSNMPSupplies keywords in PPDs and deleting options.

Scheduler

4. Filter security; Filters and backends must now have group write permissions disabled.

Print Filters

5. HP-GL/2 filter; The HP-GL/2 filter is no longer provided with CUPS.
6. PDF filter; The PDF filter now supports new Poppler and Ghostscript options.
7. PWG Raster driver; Added a new PWG Raster printer driver filter.
8. SCSI backend; The SCSI backend is no longer provided with CUPS.

CUPS API

9. CUPS headers; Changes to the main CUPS header may require code changes to applications and toolkits. Users of PPD functions must now include the <cups/ppd.h> header file explicitly since the <cups/cups.h> header no longer does so.
10. HTTP support: Applications can now set a per-connection timeout interval and callback for HTTP operations as well as query and set SSL/TLS X.509 certificates.
11. Raster support; The CUPS raster functions now support the creation of PWG Raster files and streams, and a new callback-based context function allows reading and writing from objects other than file descriptors.