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GS(1)				  Ghostscript				 GS(1)

NAME
       gs  -  Ghostscript  (PostScript	and  PDF language interpreter and pre‐
       viewer)

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 For‐
       mat (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 infor‐
       mation.	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	 spec‐
       ify  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 Ghost‐
       script: 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 "-sOut‐
       putFile=" switch with "%d" in a filename template:

	    -sOutputFile=foo%d.xyz

       Each resulting file receives one page of output, and the files are num‐
       bered 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 sys‐
       tems, 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 Ghost‐
       script,

	    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" oper‐
	      ator) 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

       -P     Makes  Ghostscript  to  look  first in the current directory for
	      library files.  By default, Ghostscript no longer looks  in  the
	      current  directory, unless, of course, the first explicitly sup‐
	      plied directory is "." in -I.  See also the INITIALIZATION FILES
	      section  below,  and  bundled Use.htm for detailed discussion on
	      search paths and how Ghostcript finds files.

       -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 -dDEVICEYRESOLU‐
	      TION=number2.  This is for the benefit of devices such as print‐
	      ers that support multiple X and Y resolutions.  If only one num‐
	      ber 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  interac‐
	      tively  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 "system‐
       dict" 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 defi‐
       nitions 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	 Post‐
	      Script  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  out‐
	      put 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.

       /usr/local/share/ghostscript/#.##/*
	      Startup files, utilities, and basic font definitions

       /usr/local/share/ghostscript/fonts/*
	      More font definitions

       /usr/local/share/ghostscript/#.##/examples/*
	      Ghostscript demonstration files

       /usr/local/share/ghostscript/#.##/doc/*
	      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 Ghost‐
	   script makefile when the executable was built.  When gs is built on
	   Unix,    GS_LIB_DEFAULT    is    usually   "/usr/local/share/ghost‐
	   script/#.##:/usr/local/share/ghostscript/fonts" where "#.##" repre‐
	   sents the Ghostscript version number.

       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  dis‐
	      play 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 9.00.

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.

9.00			       14 September 2010			 GS(1)
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