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.ds dF /usr/lib/font
.ds dQ /usr/lib/postscript
.TH DPOST 1 "DWB 3.2"
.SH NAME
.B dpost
\-
.B troff
postprocessor for PostScript printers
.SH SYNOPSIS
\*(mBdpost\f1
.OP "" options []
.OP "" files []
.SH DESCRIPTION
.B dpost
translates
.I files
created by
.BR troff (1)
into PostScript and writes the results on the
standard output.
If no
.I files
are specified, or if
.OP \-
is one of the input
.IR files ,
the standard input is read.
The following
.I options
are understood:
.TP 0.75i
.OP \-c num
Print
.I num
copies of each page.
By default only one copy is printed.
.TP
.OP \-m num
Magnify each logical page by the factor
.IR num
(default is 1.0).
Pages are scaled uniformly about the origin,
which is located near the upper left corner of
each page.
.TP
.OP \-n num
Print
.I num
logical pages on each piece of paper,
where
.I num
can be any positive integer.
By default,
.I num
is set to 1.
.TP
.OP \-o list
Print pages whose numbers are given in the comma-separated
.IR list .
The list contains single numbers
.I N
and ranges
.IR N1\-\|N2 .
A missing
.I N1
means the lowest numbered page, a missing
.I N2
means the highest.
.TP
.OP \-p mode
Print
.I files
in either \*(mBportrait\fP or \*(mBlandscape\fP mode.
Only the first character of
.I mode
is significant.
The default
.I mode
is \*(mBportrait\fP.
.TP
.OP \-w num
Set the line width used to implement
.B troff
graphics commands to
.I num
points, where a point is approximately 1/72
of an inch.
By default
.I num
is set to 0.3 points.
.TP
.OP \-x num
Translate the origin
.I 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
.I num
moves everything right.
The default offset is 0 inches.
.TP
.OP \-y num
Translate the origin
.I num
inches along the positive y axis.
Positive
.I num
moves text down the page.
The default offset is 0.
.TP
.OP \-B
Include
.MW %%BoundingBox
comments in the output file.
Should only be used when the comments are needed
for picture inclusion.
Output is forced onto an 8.5\(mu11-inch page.
.TP
.OP \-E name
Set the character encoding for text fonts to
.IR name .
Requesting
.I name
means include file
.MI \*(dQ/ name .enc \f1.
A nonexistent encoding file is silently ignored.
There is no default.
.TP
.OP \-F dir
Use
.I dir
as the font directory.
The default
.I dir
is
.MR \*(dF ,
and
.B dpost
reads
.SM ASCII
font files from directory
.MR \*(dF/devpost .
.TP
.OP \-H dir
Use
.I dir
as the host-resident font directory.
A file in
.I dir
that matches the name of the
.B troff
font is assumed to be a host resident font program
and is included in
.B dpost
output.
There is no default.
.TP
.OP \-L \^file
Use
.I file
as the PostScript prologue.
The default is
.MR \*(dQ/dpost.ps .
.TP
.OP \-T name
Use font files for device
.I name
as the best description of available PostScript fonts.
By default,
.I name
is
\*(mBpost\fP
and
.B dpost
reads
.SM ASCII
files from
.MR \*(dF/devpost .
.br
.ne 1i
.PP
Three options allow insertion of arbitrary PostScript
at controlled points in the translation process:
.TP 0.75i
.OP \-C \^file
Copy
.I file
to the output file;
.I file
must contain legitimate PostScript.
.TP
.OP \-P string
Include
.I string
in the output file;
.I string
must be legitimate PostScript.
.TP
.OP \-R action
Requests special
.I action
(e.g.,
.MR manualfeed )
on a per page or global basis.
The
.I action
string can be given as
.IR request \|,
.IM request : page\f1\|,
or
.IM request : page : file\f1\|.
If
.I page
is omitted or given as 0 the request
applies to all pages.
If
.I file
is omitted the request
lookup is done in
.MR \*(dQ/ps.requests .
.PP
All
.I files
should be prepared by
.B troff
for the same device.
Device tables that describe real PostScript fonts that can be
used by
.B dpost
should include
.EX
PDL PostScript
.EE
in their
.SM DESC
file.
Tables that depend on a non-standard character set encoding indicate
that fact by an
.MW Encoding
entry in their
.SM DESC
file.
For example,
.EX
Encoding Latin1
.EE
means include file
.MR \*(dQ/Latin1.enc .
The
.OP \-E
option overrides the
.SM DESC
setting.
.SH EXAMPLES
.PP
A typical command line might be:
.EX
pic  \f2files\fP | tbl | eqn | troff -mm | dpost
.EE
.SH DIAGNOSTICS
A 0 exit status is returned if
.I files
were successfully translated,
while 2 often indicates a syntax error in the input
.IR files .
.SH WARNINGS
.PP
.B dpost
output does not usually conform to Adobe's file-structuring conventions.
Send the output through
.B postreverse
to produce a minimally conforming PostScript file.
.PP
Emulation is expensive and does not always produce satisfactory results.
No attempt has been made to implement the character sets or fonts available
on all devices supported by
.BR troff .
Missing characters are replaced by white space, and unrecognized
fonts default to one of the Times fonts (e.g.,
.MR R ,
.MR I ,
.MR B ,
or
.MR BI ).
.SH FILES
.MW \*(dF/devpost/*
.br
.MW \*(dF/devpost/charlib/*
.br
.MW \*(dQ/dpost.ps
.br
.MW \*(dQ/color.ps
.br
.MW \*(dQ/draw.ps
.br
.MW \*(dQ/forms.ps
.br
.MW \*(dQ/ps.requests
.SH SEE ALSO
.BR buildtables (1),
.BR postio (1),
.BR postprint (1),
.BR postreverse (1),
.BR psencoding (1),
.BR troff (1),
.BR font (5),
.BR troff (5)

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