Provided by: ghostscript_9.10~dfsg-0ubuntu10_amd64 bug

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  and  output  to  an output device (may be a file or an X11 window preview, see
       below). 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.

       If  built  with  X11  support, often the default device is an X11 window (previewer), else
       ghostscript will typically use the bbox device and print on stdout the  dimension  of  the
       postscript file.

       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

       -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 supplied 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 -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
              Restricts  file operations the job can perform.  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.

SAFER MODE

       The -dSAFER option disables the "deletefile"  and  "renamefile"  operators  and  prohibits
       opening  piped  commands  ("%pipe%cmd").  Only  "%stdout"  and "%stderr" can be opened for
       writing. It also disables reading from files,  except  for  "%stdin",  files  given  as  a
       command  line  argument,  and  files  contained  in paths given by LIBPATH and FONTPATH or
       specified by the system params /FontResourceDir and /GenericResourceDir.

       This mode also sets the .LockSafetyParams  parameter  of  the  initial  output  device  to
       protect  against  programs  that  attempt  to  write  to files using the OutputFile device
       parameter.  Since  the  device  parameters  specified  on  the  command  line,   including
       OutputFile,  are set prior to SAFER mode, use of "-sOutputFile=..." on the command line is
       unrestricted.

       SAFER    mode    prevents    changing    the    /GenericResourceDir,     /FontResourceDir,
       /SystemParamsPassword, and /StartJobPassword.

       While  SAFER  mode  is not the default, it is the default for many wrapper scripts such as
       ps2pdf and may be the default in a subsequent release of Ghostscript.  Thus  when  running
       programs  that  need  to  open  files  or  set  restricted  parameters you should pass the
       -dNOSAFER command line option or its synonym -dDELAYSAFER.

       When running with -dNOSAFER it is possible to perform a  "save"  followed  by  ".setsafe",
       execute  a  file  or  procedure in SAFER mode, and then use "restore" to return to NOSAFER
       mode.  In order to prevent the save object from being restored  by  the  foreign  file  or
       procedure,  the  ".runandhide"  operator  should  be used to hide the save object from the
       restricted procedure.

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/gs-gpl/#.##/*/*
              Startup files, utilities, and basic font definitions

       /usr/share/fonts/type1/gsfonts/*
              More font definitions from the gsfonts package

       /usr/share/doc/gs-gpl/examples/*
              Ghostscript demonstration files

       /usr/share/doc/gs-gpl/*
              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/gs-gpl/#.## 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 9.10.

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.