Re: Does gnuplot still read commands from stdin?

[Philipp K. J. <ja...@ie...>]

No, it doesn't work for me.

Here is the contents of my test script:

set t pngcairo
plot sin(x)

I invoke it like this:

cat script.gp | gnuplot > graph.png

When I use gnuplot 4.6 patchlevel 3 (which comes
with my distro), all is well. But when I use version
5, nothing happens - I simply get dropped into an
interactive session.

Mind you, batch processing works with version 5:

gnuplot5 script.gp > graph.png

is fine.


Here are the specifics:

Linux puget 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC
2013 x86_64 x86_64 x86_64 GNU/Linux


        G N U P L O T
        Version 5.0 patchlevel 0    last modified 2015-01-01 

        Copyright (C) 1986-1993, 1998, 2004, 2007-2015
        Thomas Williams, Colin Kelley and many others

        gnuplot home:     http://www.gnuplot.info
        faq, bugs, etc:   type "help FAQ"
        immediate help:   type "help"  (plot window: hit 'h')


On Mon, 9 Feb 2015 00:26:20 -0500
Jonathan Thornburg <jt...@as...> wrote:

> Hi,
> 
> On Sun, Feb 08, 2015 at 07:37:15PM -0800, Philipp K. Janert wrote:
> > It used to be possible to pipe commands to gnuplot:
> > 
> > 	cat script.gp | gnuplot
> > 
> > When I try this with gp5, gnuplot seems to ignore 
> > the input. 
> > 
> > I did not see any comment on this in the documentation
> > either way. What behavior should I expect?
> 
> Piping commands to gnuplot works fine for me with gnuplot 5.0.0
> running on OpenBSD 5.6.  In fact, I often do this for visualization:
> I've written a Tk/Perl program 'slider' which provides a GUI to walk
> through a data set, and outputs gnuplot commands for visualization;
> I use it via shell scripts like this one:
> 
> #!/bin/sh
> slider --min   401.022164175591         \
>        --delta   1.00255541043898       \
>        --max   501.277705219488         \
>        --continuous                     \
>        --command-file ../Phi.rl1-4.3D-slider-gnuplot-template \
>   | gnuplot
> 
> For a standalone test:
> 
> % uname -a
> OpenBSD copper.astro.indiana.edu 5.6 GENERIC.MP#0 amd64
> % echo 'show version long' | gnuplot
> 
>         G N U P L O T
>         Version 5.0 patchlevel 0    last modified 2015-01-01 
> 
>         Copyright (C) 1986-1993, 1998, 2004, 2007-2015
>         Thomas Williams, Colin Kelley and many others
> 
>         gnuplot home:     http://www.gnuplot.info
>         faq, bugs, etc:   type "help FAQ"
>         immediate help:   type "help"  (plot window: hit 'h')
> Compile options:
> -READLINE  +LIBREADLINE  -HISTORY  
> -BACKWARDS_COMPATIBILITY  +BINARY_DATA  
> +GD_PNG  +GD_JPEG  +GD_TTF  +GD_GIF  +ANIMATION  
> -USE_CWDRC  +X11  +X11_POLYGON  +MULTIBYTE  +X11_EXTERNAL +USE_MOUSE
> +HIDDEN3D_QUADTREE +DATASTRINGS  +HISTOGRAMS  +OBJECTS  +STRINGVARS
> +MACROS  +THIN_SPLINES  +IMAGE  +USER_LINETYPES +STATS
> +EXTERNAL_FUNCTIONS 
> 
> GNUPLOT_DRIVER_DIR = "/usr/local/libexec/gnuplot/5.0"
> GNUPLOT_PS_DIR     = "/usr/local/share/gnuplot/5.0/PostScript"
> HELPFILE           = "/usr/local/share/gnuplot/5.0/gnuplot.gih"
> 
> % echo 'set term x11 persist; plot sin(x)' | gnuplot
> % 
> 
> That last command produced an X window with the plot.
> 
> 
> What gnuplot version are you using, and on what system?
> 
> ciao,
>