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GS(1) Ghostscript GS(1) NAME gs - Ghostscript (PostScript and PDF language interpreter and pre- viewer) SYNOPSIS gs [ options ] [ files ] ... DESCRIPTION The gs 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 (nor- mally 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 (ei- ther in a file or from the keyboard), at end-of-file, or at an inter- rupt signal (such as Control-C at the keyboard). The interpreter recognizes many option switches, some of which are de- scribed below. Please see the usage documentation for complete informa- tion. Switches may appear anywhere in the command line and apply to all files thereafter. Invoking Ghostscript with the -h or -? switch pro- duces a message which shows several useful switches, all the devices known to that executable, and the search path for fonts. 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 Ghost- script: invoke Ghostscript and type devicenames == but the first device on the resulting list may not be the default de- vice 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: setpagedevice (command line) GS_DEVICE (first device in build list) 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. 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". You can also send output to a pipe. For example, to pipe output to the "lpr" command, use the option -sOutputFile=%pipe%lpr 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 li- brary 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 -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. Now the default mode of operation. -dWRITESYSTEMDICT Leaves "systemdict" writable. This is necessary when running special utility programs, but is strongly discouraged as it by- passes normal Postscript security measures. -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. SAFER MODE The -dSAFER option restricts file system accesses to those files and directories allowed by the relevant environment variables (such as GS_LIB) or by the command line parameters (see https://ghost- script.com/doc/current/Use.htm for details). SAFER mode is now the default mode of operation. Thus when running pro- grams that need to open files or set restricted parameters you should pass the -dNOSAFER command line option or its synonym -dDELAYSAFER. Running with NOSAFER/DELAYSAFER (as the same suggests) loosens the se- curity and is thus recommended ONLY for debugging or in VERY controlled workflows, and strongly NOT recommended in any other circumstances. FILES The locations of many Ghostscript run-time files are compiled into the executable when it is built. Typically based in /usr/local. /usr/local/share/ghostscript/#.##/* Startup files, utilities, and basic font definitions /usr/local/share/ghostscript/fonts/* More font definitions 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 di- rectory if no directory is specified. If this fails, and the file name doesn't specify an explicit directory, 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. Usually "/usr/lo- cal/share/ghostscript/#.##:/usr/local/share/ghostscript/fonts" where "#.##" represents 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 op- tions 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 BUGS See http://bugs.ghostscript.com/ and the Usenet news group comp.lang.postscript. VERSION This document was last revised for Ghostscript version 10.04.0. 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. 10.04.0 18 Sept 2024 GS(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SPECIAL NAMES | SAFER MODE | FILES | INITIALIZATION FILES | ENVIRONMENT | X RESOURCES | BUGS | VERSION | AUTHOR
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