281 lines
6.7 KiB
Plaintext
281 lines
6.7 KiB
Plaintext
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.TH GS 1
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.\" This file is an edited version of /sys/src/cmd/gs/man/gs.1, to
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.\" document the local installation and remove needless background.
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.de TQ
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.br
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.ns
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.TP \\$1
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..
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.SH NAME
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gs \- Aladdin Ghostscript (PostScript and PDF language interpreter)
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.SH SYNOPSIS
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.B gs
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[
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.I options
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] [
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.I files
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] ...
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.br
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.SH DESCRIPTION
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Ghostscript is a programming language similar to Adobe Systems'
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PostScript and PDF languages, which are in turn similar to Forth.
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.I Gs
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reads
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.I files
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in sequence and executes them as Ghostscript programs.
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After doing this, it reads further input from the standard input.
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If the
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.I file
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.B -
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is named, however, it represents the standard input, which is read
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in order and not after the files on the command line.
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Each line is interpreted separately.
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The `quit' command, or end-of-file, exits the interpreter.
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.PP
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The interpreter recognizes several switches described below, which may appear
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anywhere in the command line and apply to all files thereafter.
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.PP
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The
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.B -h
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or
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.B -?
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options give help and list the available devices; the default is
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.BR plan9 ,
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which produces compressed image files suitable for viewing with
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.IR page (1)
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(but note that
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.IR page (1)
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will invoke
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.I gs
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automatically; see its manual).
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.PP
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Ghostscript may be built with multiple output devices. Ghostscript
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normally opens the first one and directs output to it. To use device xyz
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as the initial output device, include the switch
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.EX
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-sDEVICE=xyz
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.EE
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in the command line. This switch must precede the first PostScript
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file and only its first invocation has any effect.
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Output devices can also be selected by the word
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.B selectdevice
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in the input language, or by setting the environment variable
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.BR GS_DEVICE .
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The order of precedence for
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these alternatives, highest to lowest, is:
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.EX
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selectdevice
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\f1(command line)\fP
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GS_DEVICE
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plan9
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.EE
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.PP
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Normally, output goes
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directly to a scratch file.
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To send the output to a series of files
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.BR foo1.xyz ,
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.BR foo2.xyz ,
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etc., use the switch
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.EX
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-sOutputFile=foo%d.xyz
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.EE
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The %d may be any
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.I printf
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(see
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.IR fprintf (2))
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format specification. Each file will receive one page of output.
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If the file name begins with a pipe character,
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the output will be sent as standard input to the following pipeline.
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For example,
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.EX
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-sOutputFile=|lp
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.EE
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Specifying the file
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.B -
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will send the files to standard output; this also requires enabling the
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.B -q
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option.
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.SS "Initialization files"
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When looking for the initialization files
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.RB ( gs_*.ps ),
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the files related
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to fonts, or the file for the
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.B run
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operator, Ghostscript first looks for the file (if
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it doesn't start with a slash) in the current directory, then in these
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directories in the following order:
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.TP
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1.
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Any directories specified by
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.B -I
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switches in the command
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line (see below);
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.TP
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2.
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Any directories specified by the
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.B GS_LIB
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environment variable;
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.TP
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3.
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The directories
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.BR /sys/lib/ghostscript ,
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.BR /sys/lib/ghostscript/font ,
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and
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.BR /sys/lib/postscript/font .
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.PP
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The
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.B GS_LIB
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or
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.B -I
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parameters may be
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a single directory or a colon-separated list.
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.SS Options
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.TP
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.BI -- " filename arg1 ..."
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Take the next argument as a file name as usual, but take all
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remaining arguments (even if they have the syntactic form of switches)
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and define the name ARGUMENTS in userdict (not systemdict) as an
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array of those strings,
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.I before
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running the file. When Ghostscript
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finishes executing the file, it exits back to the shell.
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.TP
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.BI -D name = token
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.TQ
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.BI -d name = token
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Define a name in systemdict with the given definition. The token must
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be exactly one token (as defined by the `token' operator) and must not
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contain any white space.
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.TP
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.BI -D name
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.TQ
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.BI -d name
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Define a name in systemdict with value=null.
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.TP
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.BI -S name = string
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.TQ
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.BI -s name = string
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Define a name in systemdict with a given string as value. This is
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different from
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.BR -d .
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For example,
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.B -dname=35
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is equivalent to the
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program fragment
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.EX
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/name 35 def
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.EE
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whereas
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.B -sname=35
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is equivalent to
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.EX
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/name (35) def
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.EE
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.TP
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.B -q
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Quiet startup: suppress normal startup messages, and also do the
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equivalent of
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.BR -dQUIET .
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.TP
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.BI -g number1 x number2
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Equivalent to
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.BI -dDEVICEWIDTH= number1
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and
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.BI -dDEVICEHEIGHT= number2\f1.
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This is for the benefit of devices, such as windows,
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that allow width and height to be specified.
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.TP
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.BI -r number
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.TQ
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.BI -r number1 x number2
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Equivalent to
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.BI -dDEVICEXRESOLUTION= number1
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and
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\fL-dDEVICE\%YRESOLUTION= \f2\%number2\f1.
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This is for the benefit of devices, such as printers,
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that support multiple X and Y resolutions.
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If only one number is given, it is used for both X and Y resolutions.
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.TP
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.BI -I directories
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Adds the designated list of directories at the head of the
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search path for library files.
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.PP
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Note that gs_init.ps makes systemdict read-only, so the values of names
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defined with -D/d/S/s cannot be changed (although, of course, they can be
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superseded by definitions in userdict or other dictionaries.)
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.SS "Special names"
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.TP
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.B -dBATCH
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Exit after the last file has been processed.
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This is equivalent to listing
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.I quit.ps
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at the end of the list of files.
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.TP
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.B -dDISKFONTS
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Causes individual character outlines to be loaded from the disk
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the first time they are encountered. (Normally Ghostscript loads all the
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character outlines when it loads a font.) This may allow loading more
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fonts into RAM, at the expense of slower rendering.
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.TP
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.B -dNOCACHE
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Disables character caching. Only useful for debugging.
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.TP
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.B -dNOBIND
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Disables the `bind' operator. Only useful for debugging.
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.TP
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.B -dNODISPLAY
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Suppresses the normal initialization of the output device.
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This may be useful when debugging.
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.TP
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.B -dNOPAUSE
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Disables the prompt and pause at the end of each page.
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This may be desirable for applications where another program
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(e.g.
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.IR page (1))
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is
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`driving' Ghostscript.
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.TP
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.B -dSAFER
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Disables the
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.B deletefile
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and
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.B renamefile
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operators, and the
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ability to open files in any mode other than read-only. This may be
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desirable for spoolers or other sensitive environments.
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Files in the
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.B /fd
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directory may still be opened for writing.
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.TP
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.B -dWRITESYSTEMDICT
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Leaves systemdict writable. This is necessary when running
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special utility programs such as font2c and pcharstr, which must bypass
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normal PostScript access protection.
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.TP
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.BI -sDEVICE= device
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Selects an alternate initial output device, as described above.
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.TP
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.BI -sOutputFile= filename
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Selects an alternate output file (or pipe) for the initial output
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device, as described above.
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.SH FILES
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.TP
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.B /sys/lib/ghostscript/*
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Startup-files, utilities, examples, and basic font definitions.
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.TP
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.B /sys/lib/ghostscript/fonts/*
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Additional font definitions.
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.SH SOURCE
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.B /sys/src/cmd/gs
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.SH "SEE ALSO"
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.IR page (1),
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.IR ps2pdf (1)
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.br
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The Ghostscript document files in
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.B doc
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and
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.B man
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subdirectories of the source directory.
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.SH BUGS
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The treatment of standard input is non-standard.
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