NAME
gs - Ghostscript (PostScript and PDF language interpreter and
previewer)
SYNOPSIS
gs [ options ] [ files ] ... (Unix, VMS)
gswin32c [ options ] [ files ] ... (MS Windows)
gswin32 [ options ] [ files ] ... (MS Windows 3.1)
gsos2 [ options ] [ files ] ... (OS/2)
DESCRIPTION
The gs (gswin32c, gswin32, gsos2) command invokes Ghostscript, an
interpreter of Adobe Systems' PostScript(tm) and Portable Document
Format (PDF) languages. gs reads "files" in sequence and executes them
as Ghostscript programs. After doing this, it reads further input from
the standard input stream (normally the keyboard), interpreting each
line separately. The interpreter exits gracefully when it encounters
the "quit" command (either in a file or from the keyboard), at end-of-
file, or at an interrupt signal (such as Control-C at the keyboard).
The interpreter recognizes many option switches, some of which are
described below. Please see the usage documentation for complete
information. Switches may appear anywhere in the command line and apply
to all files thereafter. Invoking Ghostscript with the -h or -? switch
produces a message which shows several useful switches, all the devices
known to that executable, and the search path for fonts; on Unix it
also shows the location of detailed documentation.
Ghostscript may be built to use many different output devices. To see
which devices your executable includes, run "gs -h". Unless you
specify a particular device, Ghostscript normally opens the first one
of those and directs output to it, so if the first one in the list is
the one you want to use, just issue the command
gs myfile.ps
You can also check the set of available devices from within
Ghostscript: invoke Ghostscript and type
devicenames ==
but the first device on the resulting list may not be the default
device you determine with "gs -h". To specify "AbcXyz" as the initial
output device, include the switch
-sDEVICE=AbcXyz
For example, for output to an Epson printer you might use the command
gs -sDEVICE=epson myfile.ps
The "-sDEVICE=" switch must precede the first mention of a file to
print, and only the switch's first use has any effect.
Finally, you can specify a default device in the environment variable
GS_DEVICE. The order of precedence for these alternatives from highest
to lowest (Ghostscript uses the device defined highest in the list) is:
Some devices can support different resolutions (densities). To specify
the resolution on such a printer, use the "-r" switch:
gs -sDEVICE=<device> -r<xres>x<yres>
For example, on a 9-pin Epson-compatible printer, you get the lowest-
density (fastest) mode with
gs -sDEVICE=epson -r60x72
and the highest-density (best output quality) mode with
gs -sDEVICE=epson -r240x72.
If you select a printer as the output device, Ghostscript also allows
you to choose where Ghostscript sends the output -- on Unix systems,
usually to a temporary file. To send the output to a file "foo.xyz",
use the switch
-sOutputFile=foo.xyz
You might want to print each page separately. To do this, send the
output to a series of files "foo1.xyz, foo2.xyz, ..." using the
"-sOutputFile=" switch with "%d" in a filename template:
-sOutputFile=foo%d.xyz
Each resulting file receives one page of output, and the files are
numbered in sequence. "%d" is a printf format specification; you can
also use a variant like "%02d".
On Unix and MS Windows systems you can also send output to a pipe. For
example, to pipe output to the "lpr" command (which, on many Unix
systems, directs it to a printer), use the option
-sOutputFile=%pipe%lpr
Note that the '%' characters need to be doubled on MS Windows to avoid
mangling by the command interpreter.
You can also send output to standard output:
-sOutputFile=-
or
-sOutputFile=%stdout%
In this case you must also use the -q switch, to prevent Ghostscript
from writing messages to standard output.
To select a specific paper size, use the command line switch
-sPAPERSIZE=<paper_size>
for instance
-sPAPERSIZE=a4
or
-sPAPERSIZE=legal
Most ISO and US paper sizes are recognized. See the usage documentation
for a full list, or the definitions in the initialization file
"gs_statd.ps".
Ghostscript can do many things other than print or view PostScript and
PDF files. For example, if you want to know the bounding box of a
PostScript (or EPS) file, Ghostscript provides a special "device" that
just prints out this information.
For example, using one of the example files distributed with
Ghostscript,
gs -sDEVICE=bbox golfer.ps
prints out
%%BoundingBox: 0 25 583 732
%%HiResBoundingBox: 0.808497 25.009496 582.994503 731.809445
OPTIONS
-- filename arg1 ...
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.
-Dname=token
-dname=token
Define a name in "systemdict" with the given definition. The
token must be exactly one token (as defined by the "token"
operator) and may contain no whitespace.
-Dname
-dname Define a name in "systemdict" with value=null.
-Sname=string
-sname=string
Define a name in "systemdict" with a given string as value.
This is different from -d. For example, -dname=35 is equivalent
to the program fragment
/name 35 def
whereas -sname=35 is equivalent to
/name (35) def
-q Quiet startup: suppress normal startup messages, and also do the
equivalent of -dQUIET.
-gnumber1xnumber2
Equivalent to -dDEVICEWIDTH=number1 and -dDEVICEHEIGHT=number2.
This is for the benefit of devices (such as X11 windows) that
require (or allow) width and height to be specified.
-rnumber
-rnumber1xnumber2
Equivalent to -dDEVICEXRESOLUTION=number1 and
-dDEVICEYRESOLUTION=number2. This is for the benefit of devices
such as printers that support multiple X and Y resolutions. If
only one number is given, it is used for both X and Y
resolutions.
-Idirectories
Adds the designated list of directories at the head of the
search path for library files.
- This is not really a switch, but indicates to Ghostscript that
standard input is coming from a file or a pipe and not
interactively from the command line. Ghostscript reads from
standard input until it reaches end-of-file, executing it like
any other file, and then continues with processing the command
line. When the command line has been entirely processed,
Ghostscript exits rather than going into its interactive mode.
Note that the normal initialization file "gs_init.ps" makes
"systemdict" read-only, so the values of names defined with -D, -d, -S,
or -s cannot be changed (although, of course, they can be superseded by
definitions in "userdict" or other dictionaries.)
SPECIAL NAMES
-dDISKFONTS
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.
-dNOCACHE
Disables character caching. Useful only for debugging.
-dNOBIND
Disables the "bind" operator. Useful only for debugging.
-dNODISPLAY
Suppresses the normal initialization of the output device. This
may be useful when debugging.
-dNOPAUSE
Disables the prompt and pause at the end of each page. This may
be desirable for applications where another program is driving
Ghostscript.
-dNOPLATFONTS
Disables the use of fonts supplied by the underlying platform
(for instance X Windows). This may be needed if the platform
fonts look undesirably different from the scalable fonts.
-dSAFER
Disables the "deletefile" and "renamefile" operators and the
ability to open files in any mode other than read-only. This
strongly recommended for spoolers, conversion scripts or other
sensitive environments where a badly written or malicious
PostScript program code must be prevented from changing
important files.
-dWRITESYSTEMDICT
Leaves "systemdict" writable. This is necessary when running
special utility programs such as font2c and pcharstr, which must
bypass normal PostScript access protection.
-sDEVICE=device
Selects an alternate initial output device, as described above.
-sOutputFile=filename
Selects an alternate output file (or pipe) for the initial
output device, as described above.
FILES
The locations of many Ghostscript run-time files are compiled into the
executable when it is built. On Unix these are typically based in
/usr/local, but this may be different on your system. Under DOS they
are typically based in C:\GS, but may be elsewhere, especially if you
install Ghostscript with GSview. Run "gs -h" to find the location of
Ghostscript documentation on your system, from which you can get more
details. On a Debian system they are in /usr.
/usr/share/ghostscript/#.##/*
Startup files, utilities, and basic font definitions
/usr/share/fonts/type1/gsfonts/*
More font definitions
/usr/share/doc/ghostscript/examples/*
Ghostscript demonstration files
/usr/share/doc/ghostscript/*
Diverse document files
INITIALIZATION FILES
When looking for the initialization files "gs_*.ps", the files related
to fonts, or the file for the "run" operator, Ghostscript first tries
to open the file with the name as given, using the current working
directory if no directory is specified. If this fails, and the file
name doesn't specify an explicit directory or drive (for instance,
doesn't contain "/" on Unix systems or "\" on MS Windows systems),
Ghostscript tries directories in this order:
1. the directories specified by the -I switches in the command line
(see below), if any;
2. the directories specified by the GS_LIB environment variable, if
any;
3. the directories specified by the GS_LIB_DEFAULT macro in the
Ghostscript makefile when the executable was built. When gs is
built on Unix, GS_LIB_DEFAULT is usually
"/usr/local/share/ghostscript/#.##:/usr/local/share/ghostscript/fonts"
where "#.##" represents the Ghostscript version number. They are
"/usr/share/ghostscript/#.##" on a Debian system.
Each of these (GS_LIB_DEFAULT, GS_LIB, and -I parameter) may be either
a single directory or a list of directories separated by ":".
ENVIRONMENT
GS_OPTIONS
String of options to be processed before the command line
options
GS_DEVICE
Used to specify an output device
GS_FONTPATH
Path names used to search for fonts
GS_LIB Path names for initialization files and fonts
TEMP Where temporary files are made
X RESOURCES
Ghostscript, or more properly the X11 display device, looks for the
following resources under the program name "Ghostscript":
borderWidth
The border width in pixels (default = 1).
borderColor
The name of the border color (default = black).
geometry
The window size and placement, WxH+X+Y (default is NULL).
xResolution
The number of x pixels per inch (default is computed from
WidthOfScreen and WidthMMOfScreen).
yResolution
The number of y pixels per inch (default is computed from
HeightOfScreen and HeightMMOfScreen).
useBackingPixmap
Determines whether backing store is to be used for saving
display window (default = true).
See the usage document for a more complete list of resources. To set
these resources on Unix, put them in a file such as "~/.Xresources" in
the following form:
Ghostscript*geometry: 612x792-0+0
Ghostscript*xResolution: 72
Ghostscript*yResolution: 72
Then merge these resources into the X server's resource database:
% xrdb -merge ~/.Xresources
SEE ALSO
The various Ghostscript document files (above), especially Use.htm.
BUGS
See http://bugs.ghostscript.com/ and the Usenet news group
comp.lang.postscript.
VERSION
This document was last revised for Ghostscript version 8.71.
AUTHOR
Artifex Software, Inc. are the primary maintainers of Ghostscript.
Russell J. Lang, gsview at ghostgum.com.au, is the author of most of
the MS Windows code in Ghostscript.