Mac-Source 1994 July/Mac-Source_July_1994.iso/C and C++/Graphics⁄Sound/MacGS 2.5.2ß3 Dev ƒ/(Docs)/man.doc

Text File | 1992-09-19 | 25KB | 810 lines

.\"- -*- nroff -*- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
.\"
.\"This file describes version 2.5.2 of Ghostscript.
.\"
.\"- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
.de TQ
.br
.ns
.TP \\$1
..
.TH GS 1 "August 16, 1992" "" "CAEN - The University of Michigan"
.SH NAME
gs \- PostScript previewer
.SH SYNOPSIS
.B gs
[
.I
switches
]
[
.I file1.ps file2.ps ...
]
.br
.SH DESCRIPTION
Ghostscript is an interpreter for Adobe Systems' PostScript (tm) language.
.I Gs
reads each given
.I file
in sequence and displays or prints it as a Ghostscript file.  It then
interprets commands from the primary input stream (normally the keyboard)
until an end of file character (^D or CTRL\-D) is typed.
Typing `quit' at the Ghostscript prompt also terminates Ghostscript execution.
Typing the interrupt character, e.g.,
.B control-C,
also terminates Ghostscript execution.

You can get a help message by invoking Ghostscript with
.nf
    gs \-h
.fi
or
.nf
    gs \-?
.fi

.SS "Choosing the output device"

Ghostscript may be built with multiple output devices.  Ghostscript
normally opens the first one and directs output to it.  To use device xyz
as the initial output device, include the switch

     \-sDEVICE=xyz

in the command line.  Note that this switch must precede the first .ps
file, and only its first invocation has any effect.  For example, for
printer output in a normal configuration that includes an Epson printer
driver, you might use the shell command

    gs \-sDEVICE=epson myfile.ps

instead of just

    gs myfile.ps

Alternatively, you can type

    (epson) selectdevice

    (myfile.ps) run

All output then goes to the printer instead of the display until further
notice.  You can switch devices at any time by using the selectdevice
procedure, e.g.,

    (vga) selectdevice

or

    (epson) selectdevice

As yet a third alternative, you can define an environment variable
GS_DEVICE as the desired default device name.  The order of precedence for
these alternatives, highest to lowest, is:
.nf
               selectdevice
               (command line)
               GS_DEVICE
               (first device in build list)
.fi

To select the density on a printer, use

    gs \-sDEVICE=<device> \-r<xres>x<yres>

For example, on a 9-pin Epson-compatible printer, you can get the
lowest-density (fastest) mode with

    gs \-sDEVICE=epson \-r60x72

and the highest-density mode with

    gs \-sDEVICE=epson \-r240x72.

On a 24-pin printer, the lowest density is

    gs \-sDEVICE=epson \-r60x60

and the highest-density 24-pin mode is

    gs \-sDEVICE=epson \-r360x180

If you select a printer as the output device, Ghostscript also allows you
to control where the device sends its output.  Normally, output goes
directly to the printer (PRN) on MS-DOS systems, and to a scratch file on
Unix or VMS systems.  To send the output to a series of files foo1.xyz,
foo2.xyz, ..., use the switch

    -sOutputFile=foo%d.xyz

The %d is a printf format specification; you can use other formats like
%02d.  Each file will receive one page of output.  Alternatively, to send
the output to a single file foo.xyz, with all the pages concatenated, use
the switch

    -sOutputFile=foo.xyz

On Unix systems, you can send the output directly to a pipe.  For
example, to pipe the output to the command `lpr' (which, on many Unix
systems, is the command that spools output for a printer), use the
switch

.nf
    -sOutputFile=|lpr
.fi

To find out what devices are available, type

    devicenames ==

after starting up Ghostscript.  Alternatively you can use the \-h or
-? switch in the command line, as described above.

.SS "Device configuration"

Ghostscript is normally configured to expect U.S. letter paper,
although there is a way to make A4 paper the default for certain
printers at compilation time (see devs.mak for details).  To select a
different paper size as the default, use the switch

    -sPAPERSIZE=a_known_paper_size

e.g.,

    -sPAPERSIZE=a4

or

    -sPAPERSIZE=legal

You can use any paper size listed in the table at the beginning of
gs_statd.ps.  (Individual documents can also specify a paper size,
which will take precedence over the one specified on the command
line.)

Printing on a Hewlett-Packard DeskJet or LaserJet at full resolution
(300 DPI) requires a printer with at least 1.5 Mb of memory.  150 DPI
printing requires only .5 Mb.  You can select 150 DPI printing with
the command line switch

    -r150

On MS-DOS systems using the Borland compiler, if Ghostscript gives
you a 'limitcheck in setdevice' error, it may mean Ghostscript's
standard buffer size wasn't large enough.  Likewise, if Ghostscript
gives you a 'VMerror in setdevice' error, it means the buffer size
was too large.  You can use the \-dBufferSpace= switch to set the
buffer size to a different value, e.g.,

    -dBufferSpace=50000

The default value is 25000; the smallest value Ghostscript accepts is
10000; the largest valid value is 65000.

.SS "File searching"

When looking for the initialization files (gs_*.ps), the files related to
fonts, or the file for the 'run' operator, Ghostscript first tries opening
the file with the name as given (i.e., using the current working directory
if none is specified).  If this fails, and the file name doesn't specify
an explicit directory or drive (i.e., doesn't begin with '/' on Unix
systems; doesn't contain a ':' or begin with a '/' or '\' on MS-DOS
systems; doesn't contain a ':' or a square bracket on VMS systems),
Ghostscript will try directories in the following order:

.TP
-
The directory/ies specified by the \-I switch(es) in the command
line (see below), if any;
.TP
-
The directory/ies specified by the GS_LIB environment variable,
if any;
.TP
-
The directories specified by the GS_LIB_DEFAULT macro, which is
typically set to "/usr/lib/ghostscript:/usr/lib/ghostscript/fonts"
at compilation time in the Ghostscript makefile.

.PP
Each of these (GS_LIB_DEFAULT, GS_LIB, and \-I parameter) may be either
a single directory, or a list of directories separated by a character
appropriate for the operating system (':' on Unix systems, ';' on VMS
and MS-DOS systems).

.SS "VMS-specific notes"

On VMS systems, the last character of each "directory" name indicates what
sort of entity the "directory" references.  If the "directory" name ends
with a colon, it is taken as referring to a logical device, e.g.:
        $ DEFINE GHOSTSCRIPT_DEVICE DUA1:[GHOSTSCRIPT_14]
.br
        $ DEFINE GS_LIB GHOSTSCRIPT_DEVICE:
.br
If the "directory" name ends with a closing square bracket, it is taken as
referring to a real directory, e.g.:
        $ DEFINE GS_LIB DUA1:[GHOSTSCRIPT]

To run Ghostscript with switches, you must type a command like

    $ gs "-dNODISPLAY"

because the C run time library will convert the command
parameters/arguments to lowercase unless you enclose them in double quotes
which preserves the case.

If you are on an X Windows display (for which gs is built), you can do

    $ set display/create/node="domain-name"/transport=tcpip

For example,

.nf
    $ set display/create/node="doof.city.com"/transport=tcpip
.fi

and then run Ghostscript

    $ gs

If you write printer output to a file and then want to print the file
later, use the "/PASSALL" qualifier to the PRINT command.


.SS "MS-DOS notes"

If you are running Ghostscript on a MS-DOS machine with a display
that is not EGA/VGA compatible, you must use the Borland compiler.
You must build Ghostscript with the BGI driver as the default, and
you will need the appropriate .BGI file from the Borland Turbo C
library.  (Ghostscript includes the EGA/VGA driver in the
executable.)

If you are using the BGI driver, two additional environment variables
become relevant:
.TP
BGIPATH
defines the directory where Ghostscript will look for
the appropriate BGI driver.  If BGIPATH is not defined, Ghostscript will
look in the directory defined as BGIDIR in the makefile.  In either case,
if no driver is found in the designated directory, Ghostscript will look
in the current directory.
.TP
BGIUSER
a string of the form nn.dname, where nn is a hexadecimal
number giving a display mode and dname is the name of a file containing a
user-supplied BGI driver.  If BGIUSER is defined and the BGI device is
selected, Ghostscript will supply nn as the display mode and will obtain
the driver from the file named dname.

Some applications, such as Microsoft Word, require a prologue in front of
the PostScript files they output.  In the case of Word, this is one of the
*.ini files included with the Word distribution.  Other applications may
require other prologues.  These may be specified on the Ghostscript
command line, e.g.,
    gs prologue.ini myfile.ps


.SS "X Windows resources"

Ghostscript looks for the following resources under the program name
``Ghostscript'':
.TP
.B borderWidth
the border width in pixels (default = 1)
.TP
.B borderColor
the name of the border color (default = black)
.TP
.B geometry
the window size and placement, WxH+X+Y (default = ???)
.TP
.B xResolution
the number of x pixels per inch default is computed from WidthOfScreen
and WidthMMOfScreen
.TP
.B yResolution
the number of y pixels per inch default is computed from
HeightOfScreen and HeightMMOfScreen

To set these resources, put them in a file (such as ~/.Xdefaults in X11R3
or ~/.Xresources in X11R4 or X11R5) in the following form:

.nf
    Ghostscript*geometry: 612x792-0+0
    Ghostscript*xResolution: 72
    Ghostscript*yResolution: 72
.fi

Then load the defaults into the X server:

% xrdb \-merge ~/.Xresources

.SH OPTIONS
The interpreter recognizes several switches described below, which may appear
anywhere in the command line and apply to all files thereafter.

.SS "Normal switches"

.IP \fI@filename\fR


Causes Ghostscript to read filename and treat its
contents the same as the command line.  (This is
intended primarily for getting around DOS'
128-character limit on the length of a command line.)
Switches or file names in the file may be separated by
any amount of white space (space, tab, line break);
there is no limit on the size of the file.

.IP "\fI\-\- filename arg1 ...\fR"
Takes the next argument as a file name as usual, but takes
all remaining arguments (even if they have the syntactic
form of switches) and defines the name ARGUMENTS in
userdict (not systemdict) as an array of those strings,
*before* running the file.  When Ghostscript finishes
executing the file, it exits back to the shell.

.IP \fI\-Dname=token\fR
.IP \fI\-dname=token\fR
Define a name in systemdict with the given definition.
The token must be exactly one token (as defined by the
`token' operator) and must not contain any whitespace.

.IP \fI\-Dname\fR
.IP \fI\-dname\fR
Define a name in systemdict with value=null.

.IP \fI\-Sname=string\fR
.IP \fI\-sname=string\fR
Define a name in systemdict with a given string as value.
This is different from \fI\-d\fR.  For example,
.RS
       \-dname=35
.RE
is equivalent to the program fragment
.RS
       /name 35 def
.RE
whereas
.RS
       \-sname=35
.RE
is equivalent to
.RS
       /name (35) def
.RE
.IP \fI\-q\fR
Quiet startup \-- suppress normal startup messages,
and also do the equivalent of \fI-dQUIET\fR.

.IP "\fI\-gnumber1xnumber2\fR"
Equivalent to \fI\-dDEVICEWIDTH=number1\fR and
\fI\-dDEVICEHEIGHT=number2\fR.  This is for the benefit of
devices (such as X11 windows and VESA displays) that require
(or allow) width and height to be specified.

.IP "\fI\-rnumber1xnumber2\fR"
Equivalent to \fI\-dDEVICEXRESOLUTION=number1\fR and
\fI\-dDEVICEYRESOLUTION=number2\fR.  This is for the benefit of
devices (such as printers) that support multiple
X and Y resolutions.

.IP \fI\-Idirectories\fR
Adds the designated list of directories at the head of the
search path for library files.

.IP \fI\-\fR

This is not really a switch.  It indicates to Ghostscript
that the standard input is coming from a file or a pipe.
Ghostscript reads from stdin until reaching end-of-file,
executing it like any other file, and then continues
processing the command line.  At the end of the command
line, Ghostscript exits rather than going into its
interactive mode.

.LP
Note that gs_init.ps makes systemdict read-only, so the values of names
defined with \-D/d/S/s cannot be changed (although, of course, they can be
superseded by definitions in userdict or other dictionaries.)

.SS "Special names"
.IP \fI\-dDISKFONTS\fR
causes individual character outlines to be loaded from the disk
the first time they are encountered.  (Normally Ghostscript loads all the
character outlines when it loads a font.)  This may allow loading more
fonts into RAM, at the expense of slower rendering.

.IP \fI\-dNOBIND\fR
disables the `bind' operator.  Only useful for debugging.

.IP \fI\-dNOCACHE\fR
disables character caching.  Only useful for debugging.

.IP \fI\-dNODISPLAY\fR
suppress the normal initialization of the output device.  This
may be useful when debugging.

.IP \fI\-dNOPAUSE\fR
disables the prompt and pause at the end of each page.  This may
be desirable for applications where another program is 'driving'
Ghostscript.

.IP \fI\-dSAFER\fR
disables the deletefile and renamefile operators, and the
ability to open files in any mode other than read-only.  This may be
desirable for spoolers or other sensitive environments.

.IP \fI\-dWRITESYSTEMDICT\fR
leaves systemdict writable.  This is necessary when running
special utility programs such as font2c and pcharstr, which must bypass
normal PostScript access protection.

.IP \fI\-sDEVICE=device\fR
selects an alternate initial output device, as described above.

.IP \fI\-sOutputFile=filename\fR
selects an alternate output file (or pipe) for the initial output
device, as described above.

.SS "Debugging switches"

The \fI\-T\fR and \fI\-Z\fR switch only applies if the interpreter was built for a
debugging configuration (this is usually not the case
for Ghostscript executables installed for public use).

.IP \fI\-A\fR
Turn on allocator debugging.

.IP \fI\-e\fR
Turn on tracing of error returns from operators.

.IP \fI\-E\fR
Abort when any operator returns with an error.

.IP \fI\-Mn\fR
Force the interpreter's allocator to acquire additional
memory in units of nK, rather than the default (currently
20K on MS-DOS systems, 50K on Unix).  n is a positive
decimal integer (not exceeding 63 on MS-DOS systems).

.IP \fI\-Zxxx\fR
Turn on debugging printout.
Each of the xxx characters selects an option:
if the string is empty, all options are selected.
Case is significant.
.RS
.nf
        1 = type 1 font interpreter (type1addpath)
        2 = curve subdivider/rasterizer
        a = allocator (large blocks only)
        A = allocator (all calls)
        b = bitmap image processor
        B = bitmap images, detail
        c = color/halftone mapper
        d = dictionary put/undef
        f = fill algorithm (summary)
        F = fill algorithm (detail)
        g = gsave/grestore[all]
        h = halftone renderer
        i = interpreter, just names
        I = interpreter, everything
        k = character cache
        K = character cache, every access
        l = command lists, bands
        L = command lists, everything
        m = makefont and font cache
        n = name lookup (new names only)
        o = outliner (stroke)
        p = path tracer
        q = rectangle fill
        r = arc renderer
        s = scanner
        t = tiling algorithm
        u = undo saver (for save/restore)
        U = undo saver, more detail
        v = rectangle fill
        V = device-level output
        w = compression encoder/decoder
        x = transformations
        z = trapezoid fill
.fi
.RE

.SH "EXAMPLES"
.nf
     spam% gs
      Initializing... done.
      Ghostscript 2.5.2 (9/19/92)
        Copyright (C) 1990, 1992 Aladdin Enterprises, Menlo Park, CA.
        All rights reserved.
      Distributed by Free Software Foundation, Inc.
      Ghostscript comes with NO WARRANTY: see the file LICENSE for details.
      GS> 100 100 moveto 200 400 lineto stroke
      GS> erasepage
      GS> (/usr/um/lib/ghostscript/tiger.ps) run
      >>showpage, press <return> to continue<<
      GS> quit

.fi
.SH "Unix  NOTES"

At most installations, the only available display device is x11, so
you must be running X11 windows to use ghostscript unless you use the
command line option \fI\-dNODISPLAY\fR.  There is also a script
called 'gsnd' which is just 'gs \-DNODISPLAY \-q $*'.

At most installations, Ghostscript was not built for a debugging
configuration therefore the command line option \fI\-Zxxx\fR is not
available.  This speeds up the interpreter.

Ghostscript works with color postscript files, postscript files created by
Tom Rokicki's dvips, M-PLOT, Mathematica, Tell-a-Graf, etc.  You can, for example,
preview multiple pages of a postscript file created by Latex/dvips/psfig
and you will be able to see any included postscript figure.  If the postscript
file adheres to Adobe's Document Structuring Convention, like the ones
generated by Latex/dvips, then you are advised to use
.B ghostview
to preview your postscript document for it provides a far more friendly and
graphical user interface.

Ghostscript also has the ability to convert a postscript file to a PPM file.
Once you have a file in PPM format you can display or manipulate it in many
ways.  You can, for example, use 'xv' or other tools to convert the PPM file
to a variety of formats, like GIF, TIFF, PICT, RLE, XPM, GPR (only available
on the apollos, through the program /progs/bit2bit/bin/ppm2gpr) etc.

.nf
Example:
      spam% gs
      Initializing... done.
      Ghostscript 2.5.2 (9/19/92)
        Copyright (C) 1990, 1992 Aladdin Enterprises, Menlo Park, CA.
        All rights reserved.
      Distributed by Free Software Foundation, Inc.
      Ghostscript comes with NO WARRANTY: see the file LICENSE for details.
      GS> (pstoppm.ps) run
      Usage: (file) ppmNrun
         converts file.ps to file.ppm (single page),
           or file.1ppm, file.2ppm, ... (multi page).
         N is # of bits per pixel (1, 8, or 24).
      Examples: (golfer) ppm1run   ..or..   (escher) ppm8run
      Optional commands you can give first:
         horiz_DPI vert_DPI ppmsetdensity
         (dirname/) ppmsetprefix
         page_num ppmsetfirstpagenumber
      GS> 100 120 ppmsetdensity
      GS> (/tmp/) ppmsetprefix
      GS> (tiger) ppm24run
      Writing /tmp/tiger.ppm
      GS> quit

      spam% ppmtogif < /tmp/tiger.ppm > /tmp/tiger.gif
      ppmtogif: computing colormap...
      ppmtogif: 39 colors found

      spam% ls \-l tiger.ps /tmp/tiger.ppm /tmp/tiger.gif
      \-rw-r--r--   1 oliveria    41796 Apr 21 18:44 /tmp/tiger.gif
      \-rw-r--r--   1 oliveria  3366054 Apr 21 18:36 /tmp/tiger.ppm
      \-rw-r--r--   1 oliveria    78519 Apr 21 17:39 tiger.ps
.fi

Notice that ppm24run creates huge files.

IslandDraw version 3.0 or greater is also able
to read (select 'Convert...'  under the 'File' menu) single\-page postscript
files.  It can also save the postscript file in a variety of formats.

.SH SYSTEM FILES
.TP 15
.B gs_init.ps
Ghostscript reads this automatically when it starts up.  It
contains definitions of many standard procedures and initialization for a
wide variety of things.
.TP 15
.B gs_fonts.ps
Font initialization.  gs_init.ps reads this in.  It initializes Ghostscript's font
machinery and provides some utility procedures that work with fonts.
.TP 15
.B gs_statd.ps
gs_init.ps reads this in.  It creates a dummy statusdict and
some other environmental odds and ends for the benefit of P*stScr*pt files
that really want to be printed on a LaserWriter.
.TP 15
.B gs_2asc.ps
This utility file helps extract the ASCII text from PostScript source files.
It redefines many operators.  For more information, see the comments in
the file.
.TP 15
.B gs_dps1.ps
gs_init.ps reads this in if the dps feature is included in
the configuration.  It provides support for various Display PostScript and
Level 2 features.
.TP 15
.B sym__enc.ps
the Symbol encoding, loaded only if referenced.

.SH ART
.TP 15
chess.ps
a black-and-white chessboard.
.TP 15
.B golfer.ps
a gray-scale picture of a stylishly dressed woman swinging a golf club.
.TP 15
.B escher.ps
a colored version of a hexagonally symmetric Escher drawing of
interlocking butterflies.  Can be printed on monochrome devices, with
somewhat less dramatic results.
.TP 15
.B cheq.ps
a chessboard "font" used by chess.ps (obtained from the Adobe file server).
.TP 15
.B snowflak.ps
a rectangular grid of intricate colored snowflakes.  (Renders very slowly.)
.TP 15
.B colorcir.ps
a set of nested ellipses made up of colored bars.
.TP 15
.B tiger.ps
a dramatic colored picture of a tiger's head.

.SH UTILITIES
.TP 15
.B bdftops.ps
a utility for converting BDF fonts to outline form.
.TP 15
.B decrypt.ps
a utility for decrypting the eexec section of a font.
.TP 15
.B gslp.ps
a utility for doing "line printing" of plain text files.
.TP 15
.B impath.ps
a utility for reconstructing outlines from bitmap images,
used by bdftops.
.TP 15
.B landscap.ps
a file that you can put in front of your own files to get
them rendered in landscape mode.
.TP 15
.B pstoppm.ps
a utility for rendering PostScript files onto PPM (bitmap) files.
.TP 15
.B ps2image.ps
a utility for converting an arbitrary PostScript file into a
PostScript file consisting of just bitmaps, one per page.
.TP 15
.B wrfont.ps
a utility for writing out an unprotected Type 1 font, such as
the standard Ghostscript fonts.

.SH ODDS and ENDS
.TP 15
.B empty.ps
an empty file.
.TP 15
.B lines.ps
a test program for line joins and caps.
.TP 15
.B pcharstr.ps
a program to print out the CharStrings and Subrs in a Type 1
font.
.TP 15
.B ppath.ps
a couple of utilities for printing out the current path, for debugging.
.TP 15
.B prfont.ps
a program to print a font catalog.
.TP 15
.B quit.ps
a file containing just the word "quit".
.TP 15
.B traceop.ps
a memory usage monitor for debugging.
.TP 15
.B type1ops.ps
the Type 1 font format opcodes.
.TP 15
.B unprot.ps
a program to disable access checking.

.SH FILES
.TP 15
.B Fontmap
A catalog of fonts known to
.B gs.
Lists the GhostScript name, corresponding font file name, font encoding
and font identification number for each font that
.B gs
knows.
.TP 15
.B /usr/um/lib/ghostscript
Initialization files, utilities, sample postscript files
.TP 15
.B /usr/um/lib/ghostscript/fonts
Ghostscript and Hershey fonts (*.gsf files)

.SH KNOWN PROBLEMS
The interactive interpreter requires that every statement fit on a line,
i.e., you can't have an unpaired ( or {.

On a MS\-DOS system, interrupting Ghostscript by typing ^C doesn't restore
the display mode.

The Ghostscript language does not include the following operators of the
PostScript language:
.nf
    resetfile
    banddevice, renderbands
.fi

The following are not implemented completely:
.nf
    %statementedit (file name): interpreted as equivalent to
%lineedit.
.fi

Most of the new color operators, particularly those that support the CMYK
color model, are implemented as Ghostscript language procedures, and they
essentially emulate CMYK using RGB.

The following operators that expect arrays won't accept packed arrays:
.nf
    definefont (Subrs (type 1 fonts))
    setdash (dash pattern)
    setcachedevice (bounding box)
    makeimagedevice (palette)
.fi

The file operator only recognizes modes r and w, not the newer modes r+,
w+, a, and a+.

Floating point exceptions terminate Ghostscript, rather than producing a
rangecheck error.

Some access checks aren't implemented.

copypage does nothing in the MS\-DOS implementation, and merely
synchronizes the X connection in the Unix implementation.  showpage is a
procedure that does a copypage and then beeps the bell and waits for the
user to hit a key.  (copypage does do the right thing for printers.)

strokepath produces incorrect output for dashed lines.

The implementation only looks at the PaintType of the font when doing
show, not when doing charpath.  Because of this, stroked fonts don't work
correctly with charpath.

arcto gives an error for negative radii.

Changing the contents of the Encoding array or the Metrics dictionary of a
font dynamically doesn't produce the expected result (may have no effect)
if character caching is enabled.

Halftone patterns "flip over" at the 50% coverage point, producing
anomalous visual effects on some color devices.

We have not been able to test 2\-, 4\-, and 16\-bit memory devices as
thoroughly as 1\-, 8\-, 24\-, and 32\-bit devices; please report any
problems.

Opening more than one window device at the same time doesn't work.
This is the case for both X Windows and Microsoft Windows.

restore doesn't properly undo currentgstate.

copy doesn't handle gstates.

.SH BUGS
See the netnews group ``gnu.ghostscript.bug'' for more information.

.SH "SEE ALSO"
.br
The PostScript Language Reference Manual, Adobe Systems Incorporated,
Second Edition, Addison\-Wesley Publishing Company, ISBN 0\-201\-18127\-4, 1990
.br
X(1), ghostview(1), lpr(1), dvips(1), ppm(5), xv(1)
.br