Provided by: lpr_2008.05.17+nmu1_amd64
printcap — printer capability database
The printcap file is a simplified version of the termcap(5) database used to describe line printers. The spooling system accesses the printcap file every time it is used, allowing dynamic addition and deletion of printers. Each entry in the database is used to describe one printer. This database may not be substituted for, as is possible for termcap(5), because it may allow accounting to be bypassed. The default printer is normally “lp”, though the environment variable PRINTER may be used to override this. Each spooling utility supports an option, -Pprinter, to allow explicit naming of a destination printer. Refer to the 4.3 BSD Line Printer Spooler Manual for a complete discussion on how to set up the database for a given printer.
Refer to termcap(5) for a description of the file layout. Name Type Default Description af str NULL name of accounting file br num none if lp is a tty, set baud rate (ioctl(2) call) cf str NULL cifplot data filter df str NULL tex data filter (DVI format) fc num 0 if lp is a tty, clear flag bits (⟨sgtty.h⟩) ff str ‘\f’ string to send for a form feed fo bool false print a form feed when device is opened fs num 0 if lp is a tty, set flag bits (⟨sgtty.h⟩) gf str NULL graph data filter (plot(3) format) hl bool false print the burst header page last ic bool false supports non-standard ioctl to indent printout if str NULL name of text filter which does accounting lf str /dev/console error logging file name lo str lock name of lock file lp str /dev/lp local printer device, or port@host for remote ms str NULL list of terminal modes to set or clear mx num 1000 max file size (in BUFSIZ blocks); 0=unlimited nd str NULL next directory for queues list (unimplemented) nf str NULL ditroff data filter (device independent troff) of str NULL name of output filtering program pc num 200 price per foot or page in hundredths of cents pl num 66 page length (in lines) pw num 132 page width (in characters) px num 0 page width in pixels (horizontal) py num 0 page length in pixels (vertical) rf str NULL filter for printing FORTRAN style text files rg str NULL restricted group-only group members can access rm str NULL machine name for remote printer rp str ``lp'' remote printer name argument rs bool false remote users must have a local account rw bool false open printer device for reading and writing sb bool false short banner (one line only) sc bool false suppress multiple copies sd str /var/spool/lpd spool directory sf bool false suppress form feeds sh bool false suppress printing of burst page header st str status status file name tf str NULL troff data filter (cat phototypesetter) tr str NULL trailer string to print when queue empties vf str NULL raster image filter xc num 0 if lp is a tty, clear local mode bits (tty(4)) xs num 0 if lp is a tty, set local mode bits (tty(4)) If the local line printer driver supports indentation, the daemon must understand how to invoke it.
If a printer is specified via lp (either local or remote), the lpd(8) daemon creates a pipeline of “filters” to process files for various printer types. The pipeline is not set up for remote printers specified via rm unless the local host is the same as the remote printer host given. The filters selected depend on the flags passed to lpr(1). The pipeline set up is: p pr | if regular text + pr(1) none if regular text c cf cifplot d df DVI (tex) g gf plot(3) n nf ditroff f rf Fortran t tf troff v vf raster image The if filter is invoked with arguments: if [-c] -wwidth -llength -iindent -n login -h host acct-file The -c flag is passed only if the -l flag (pass control characters literally) is specified to lpr(1). width and length specify the page width and length (from pw and pl, respectively) in characters. The -n and -h parameters specify the login name and host name of the owner of the job, respectively. The acct-file function is passed from the af printcap entry. If no if is specified, of is used instead, with the distinction that of is opened only once, while if is opened for every individual job. Thus, if is better suited to performing accounting. The of is only given the width and length flags. All other filters are called as: filter -xwidth -ylength -n login -h host acct-file where width and length are represented in pixels, specified by the px and py entries, respectively. All filters take stdin as the file, stdout as the printer, may log either to stderr or using syslog(3), and must not ignore SIGINT.
Error messages generated by the line printer programs themselves are logged by syslog(3) using the LPR facility. Messages printed on stderr of one of the filters are sent to the corresponding lf file. The filters may, of course, use syslog(3) themselves. Error messages sent to the console have a carriage return and a line feed appended to them, rather than just a line feed.
The printcap file format appeared in 4.2BSD.