lqf(4) Kernel Interfaces Manual lqf(4)
lqf - general purpose letter quality filter
/usr/lib/lpdfilters/lqf [-c] [-nlogin] [-hhost] [-wwidth] [-lnum] [-iindent] [accounting file]
The filter is used to filter text data destined for a letter quality printer, specifically the lqp02, but will work with any impact
printer: LP25, LP26, LP27, LA50, LA75, LA100, LA120, LA210, and LG01. The filter allows escape characters and control sequences to pass
through to the printer. The filter handles the device dependencies of the printers and performs accounting functions. Accounting records
are written to the file specified by the af field in at the time of completion for each job.
The filter can handle plain ASCII files and files that have been preprocessed by However, it ignores escape sequences requesting super-
scripting and subscripting.
The filter can be the specified filter in both the of and the if fields in the file. For further information, see printcap 5 . When both
fields are specified, the of filter is used only to print the banner page. It is then stopped to allow the if filter access to the
printer. The if filter maintains accounting information.
If the of field is the only one specified, the filter is used to print the banner page. It is then stopped and restarted. This allows the
of filter to be used to maintain accounting information.
If the if field is the only one specified, the banner page will be sent directly to the printer. This is not a problem for most impact
printers. For a more detailed discussion on filters see the ``Line Printer Spooler Manual'' in The Supplementary Documents.
The arguments passed to the filter depend on its use. The of filter is called with the following arguments:
lqf -wwidth -llength
The width and length values come from the pw and pl fields in the database. The if (or restarted of) filter is passed the following
lqf -c -nlogin -hhost -wwidth -lnum -iindent accounting file
The -c flag is optional, and supplied only when control characters are to be printed, that is, when the -l option of lpr(1) is used to
print the file. The -w and -l arguments are the same as for the of filter. However, they may have different values if the -w or -z options
of were used to print the file. The -n and -h arguments specify the login name and host name of the job owner. These arguments are used
to record accounting information. The -i option specifies the amount of indentation to be used. The last argument is the name of the
accounting file specified from the af field in the database.
The lf field (default "/dev/null") in the database specifies error logging file name.
Printer Capabilities Database
lpr(1), pr(1), printcap(5), lpd(8), MAKEDEV(8), pac(8)
Line Printer Spooler Manual