dpost - troff postprocessor for PostScript printers
dpost [-c num] [-e num] [-m num] [-n num] [-o list] [-w num]
[-x num] [-y num] [-F dir] [-H dir] [-L file] [-O] [-T name]
dpost translates files created by troff(1) into PostScript
and writes the results on the standard output. If no files
are specified, or if - is one of the input files, the stan-
dard input is read.
The files should be prepared by troff. The default font
files in /usr/lib/font/devpost produce the best and most
efficient output. They assume a resolution of 720 dpi, and
can be used to format files by adding the -Tpost option to
the troff call. Older versions of the eqn and pic preproces-
sors need to know the resolution that troff will be using to
format the files. If those are the versions installed on
your system, use the -r720 option with eqn and -T720 with
dpost makes no assumptions about resolutions. The first x
res command sets the resolution used to translate the input
files, the DESC.out file, usually
/usr/lib/font/devpost/DESC.out, defines the resolution used
in the binary font files, and the PostScript prologue is
responsible for setting up an appropriate user coordinate
Print num copies of each page. By default only one
copy is printed.
Sets the text encoding level to num. The recognized
choices are 0, 1, and 2. The size of the output file
and print time should decrease as num increases. Level
2 encoding will typically be about 20 percent faster
than level 0, which is the default and produces output
essentially identical to previous versions of dpost.
Magnify each logical page by the factor num. Pages are
scaled uniformly about the origin, which is located
near the upper left corner of each page. The default
magnification is 1.0.
Print num logical pages on each piece of paper, where
num can be any positive integer. By default, num is
set to 1.
Print those pages for which numbers are given in the
comma-separated list. The list contains single numbers
N and ranges N1-N2. A missing N1 means the lowest num-
bered page, a missing N2 means the highest. The page
range is an expression of logical pages rather than
physical sheets of paper. For example, if you are
printing two logical pages to a sheet, and you speci-
fied a range of 4, then two sheets of paper would
print, containing four page layouts. If you specified
a page range of 3-4, when requesting two logical
pages to a sheet; then only page 3 and page 4 layouts
would print, and they would appear on one physical
sheet of paper.
Print files in either portrait or landscape mode. Only
the first character of mode is significant. The
default mode is portrait.
Set the line width used to implement troff graphics
commands to num points, where a point is approximately
1/72 of an inch. By default, num is set to 0.3
Translate the origin num inches along the positive x
axis. The default coordinate system has the origin
fixed near the upper left corner of the page, with
positive x to the right and positive y down the page.
Positive num moves everything right. The default
offset is 0 inches.
Translate the origin num inches along the positive y
axis. Positive num moves text up the page. The default
offset is 0.
Use dir as the font directory. The default dir is
/usr/lib/font, and dpost reads binary font files from
Use dir as the host resident font directory. Files in
this directory should be complete PostScript font
descriptions, and must be assigned a name that
corresponds to the appropriate two-character troff
font name. Each font file is copied to the output file
only when needed and at most once during each job.
There is no default directory.
Use file as the PostScript prologue which, by default,
-O Disables PostScript picture inclusion. A recommended
option when dpost is run by a spooler in a networked
Use font files for device name as the best description
of available PostScript fonts. By default, name is
set to post and dpost reads binary files from
Example 1: Examples of the dpost command.
If the old versions of eqn and pic are installed on your
system, you can obtain the best possible looking output by
issuing a command line such as the following:
example% pic -T720 file | tbl | eqn -r720 | troff -mm -Tpost | dpost
example% pic file | tbl | eqn | troff -mm -Tpost | dpost
should give the best results.
The following exit values are returned:
0 Successful completion.
An error occurred.
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWpsf |
download(1), postdaisy(1), postdmd(1), postio(1), postmd(1),
postprint(1), postreverse(1), posttek(1), troff(1), attri-
Output files often do not conform to Adobe's file structur-
ing conventions. Piping the output of dpost through pos-
treverse(1) should produce a minimally conforming PostScript
Although dpost can handle files formatted for any device,
emulation is expensive and can easily double the print time
and the size of the output file. No attempt has been made to
implement the character sets or fonts available on all dev-
ices supported by troff. Missing characters will be replaced
by white space, and unrecognized fonts will usually default
to one of the Times fonts (that is, R, I, B, or BI).
An x res command must precede the first x init command, and
all the input files should have been prepared for the same
Use of the -T option is not encouraged. Its only purpose is
to enable the use of other PostScript font and device
description files, that perhaps use different resolutions,
character sets, or fonts.
Although level 0 encoding is the only scheme that has been
thoroughly tested, level 2 is fast and may be worth a try.
Man(1) output converted with