System V printing system
Printing subsystem of UNIX System V
The printing subsystem of UNIX System V is one of several standardized systems for printing on Unix, and is typical of commercial System V-based Unix versions such as Solaris and SCO OpenServer. A system running this print architecture could traditionally be identified by the use of the user command lp as the primary interface to the print system, as opposed to the BSD lpr command (though some systems provide lpr as an alias to lp).
Typical user commands available to the System V printing system are:
lp: the user command to print a document
lpstat: shows the current print queue
cancel: deletes a job from the print queue
lpadmin: a system administration command that configures the print system
lpmove: a system administration command that moves jobs between print queues
History
In the Unix programming model, device files are special files that act as access points to peripheral devices such as printers. For example, the first line printer on a Unix system might be represented by a file lp1 in the device (/dev) directory, i.e., /dev/lp1. Using the file metaphor, a document could by printed by "copying" the file onto the device: cp document /dev/lp1. While this worked well enough for the case where there was one printer per user, this model did not scale out well to multiple users having to share one printer. The solution was to create a queue (or "spool") of documents to be printed and use a daemon (system process) to manage this queue and send the documents to the printer in the order in which they arrived.
Such a system, with an lp command to send documents to the queue, was first introduced in 1973 in Version 4 of Unix. By the release of System V Release 4, the suite of utilities had grown to include commands for canceling print jobs, moving jobs among queues, enabling and disabling queues, enabling and disabling a job scheduler daemon, and status reports of the print system. The lp command handled queue documents to be printed and had over 20 different options that controlled the appearance of the document and its place in the queue, and even handled email notification of the user once the document had finished printing.
This brief starts where responsible research should: with the source description of “System V printing system” as printing subsystem of UNIX System V. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the general reference register because the source frames it as printing subsystem of UNIX System V. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated May 21, 2026. The linked authority identifier is Q7663689. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1973.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “System V printing system”, its source revision and the description used here.
- Expand the search: follow System V printing system primary sources, System V printing system archive and System research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “System V printing system”?
- What terminology or title could unlock a more precise catalogue search?
- Which cited source is closest to the event, object or claim?
Search terms from this dossier
This entry incorporates text from “System V printing system” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.