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GS





GS(1)                     User Commands                     GS(1)




NAME

     gs - Aladdin Ghostscript version 3.0 interpreter/previewer


SYNOPSIS

     gs [ options ] [ files ] ...


DESCRIPTION

     Ghostscript is a programming language similar to Adobe  Sys-
     tems'  PostScript (tm) language, which is in turn similar to
     Forth.  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  key-
     board).   Each line is interpreted separately.  To exit from
     the interpreter, enter the `quit' command.  The  interpreter
     also  exits gracefully if it encounters end-of-file.  Typing
     the interrupt character (e.g. Control-C) is also safe.

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

     You can get a help message by invoking Ghostscript with the
     -h or -? option.  This message also lists the available dev-
     ices.

     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  confi-
     guration  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:
          selectdevice



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GS(1)                     User Commands                     GS(1)



          (command line)
          GS_DEVICE
          (first device in build list)

     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.

     If you select a printer as the  output  device,  Ghostscript
     also  allows  you to control where the device sends its out-
     put.  Normally, output goes directly to a  scratch  file  on
     Unix  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 out-
     put.  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
          -sOutputFile=\|lpr
     You can also send output  to  stdout  for  piping  with  the
     switch
          -sOutputFile=-
     In this case you must also use the - q  switch,  to  prevent
     Ghostscript from writing messages to stdout.

     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; the help message
     also lists the available devices.

     To select a different  paper  size,  use  the  command  line
     switch
             -sPAPERSIZE=a_known_paper_size
     e.g.,
             -sPAPERSIZE=a4
     or
             -sPAPERSIZE=legal


INITIALIZATION FILES

     When looking for the  initialization  files  (gs_*.ps),  the
     files  related to fonts, or the file for the `run' operator,



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GS(1)                     User Commands                     GS(1)



     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), Ghostscript will try  directories
     in the following order:

     1.   The directory/ies specified by the -I switch(es) in the
          command line (see below), if any;

     2.   The directory/ies specified by the  GS_LIB  environment
          variable, if any;

     3.   The directory/ies specified by the GS_LIB_DEFAULT macro
          in  the  Ghostscript  makefile  (which  has been set to
          "/usr/local/lib/ghostscript:/usr/local/lib/ghostscript/fonts").

     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 `:'.


X RESOURCES

     Ghostscript looks for the following resources under the pro-
     gram 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 sav-
          ing display window (default = true).

     See  the  file  `use.doc'  for  a  more  complete  list   of
     resources.

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



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GS(1)                     User Commands                     GS(1)



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

     Then load the defaults into the X server:

          % xrdb -merge ~/.Xresources


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  ARGU-
          MENTS 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 must not contain any 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 -s name=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 dev-
          ices (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



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GS(1)                     User Commands                     GS(1)



          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.   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.

     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.)


SPECIAL NAMES

     -dDISKFONTS
          Causes individual character outlines to be loaded  from
          the  disk  the  first time they are encountered.  (Nor-
          mally 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.  Only useful for debugging.

     -dNOBIND
          Disables the `bind' operator.  Only useful  for  debug-
          ging.

     -dNODISPLAY
          Suppresses the normal initialization of the output dev-
          ice.  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  (e.g.  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-



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GS(1)                     User Commands                     GS(1)



          only.  This may be desirable for spoolers or other sen-
          sitive environments.

     -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 ini-
          tial output device, as described above.


FILES

     /usr/local/lib/ghostscript/*
          Startup-files, utilities, and basic font definitions.

     /usr/local/lib/ghostscript/fonts/*
          Additional font definitions.

     /usr/local/lib/ghostscript/examples/*
          Demo Ghostscript files.

     /usr/local/lib/doc/ghostscript/doc/*
          Assorted document files.


SEE ALSO

     The various Ghostscript document files (above).


BUGS

     See the network news group `comp.lang.postscript'.




















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