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gri - Online in the Cloud

Run gri in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command gri that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


gri - scientific graphics language

SYNOPSIS


gri [ OPTIONS ] [ CommandFile [ optional_arguments ]]

DESCRIPTION


Gri is a programming language for scientific graphics. It can make x-y graphs, contour-
graphs, and image graphs. In addition, Gri has a full suite of low-level graphical
elements and sufficient programming capabilities (loops, subroutines, etc) to permit
complex customization.

Gri is not point-click. In some ways it is analogous to TeX. Extensive power rewards
tolerance of a modest learning curve.

OPTIONS


If a command file (CommandFile) is named, commands are read from that file; otherwise they
are read from the keyboard. If a command file is named, then a file in which to store the
PostScript output may also be named; otherwise it is stored in a file named by
substituting the .ps extension instead of .gri in CommandFile. If no command file is
named, the output is named gri-00.ps (or gri-01.ps if gri-00.ps exists, etc).

There are 3 special forms that do no graphing:

`gri -creator postscript_file'

Extracts the Gri commands that created the Gri PostScript file.

`gri -help' or `gri -h'

Prints this help message.

`gri -version' or `gri -v'

Prints the version number of Gri.

In normal usage, where drawing is expected, Gri takes these options:

-batch or -b

Stops printing of prompts and hints.

-chatty[N] or -c[N]

Let gri print info messages

-debug or -d

Turns debugging on (sets variable ..debug.. to value 1).

-warn_offpage

Warn if any item is drawn far off a 8.5x11 inch page. (This is the default.)

-nowarn_offpage

Don't warn if any item is drawn far off a 8.5x11 inch page

-directory pathname

Specifies the directory where Gri looks for startup files; otherwise it looks in
/opt/gri/lib or at whatever directory is defined in configure shellscript, at
compile time.

-directory_default

Reports directory where gri.cmd should be found, if not supplied by -directory.

-no_bounding_box

Make bounding-box be full page.

-no_expecting

Prevent warning message if `expecting version .n.' command is missing.

-no_startup_message

Stops printing of startup message.

-publication or -p

Sets the builtin variable ..publication.. to 1; normally it is 0. One might use if
statements (`if !..publication..' ...) on drafts.

-superuser or -s

Used only by Gri programmers (who can check the value with the C function
`superuser()'.) An optional value can be supplied without spaces (e.g. `-s2') to
set the debugging level. Flags are listed below; add flags to get several actions
at once

1: print cmdline before/after substituting synonyms

2: print cmdline before/after substituting rpn expressions

4: print new commands being defined

8: print system commands and `open "... | "' commands before

they are passed to the system

128: for author's use only

256: for author's use only

Note that all flags are equal to 2 raised to an integer power. Since the flag
values are detected by a bitwise OR, you can combine flags by adding; thus
specifying a flag of 5 yields flags 1 and 4 together; specifying 15 yields flags 1,
2, 4 and 8.

-trace or -t

Makes Gri print out command lines as they are executed.

-true or -y

Makes Gri think the answer to all `query's is RETURN.

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