Hi Ulrich,

It looks like the dot program did what it was supposed to do, but, for some reason, J thinks there was an error from spawn.

I'll see if I can puzzle it out by reviewing the J source code. J does use different code for spawn on Darwin than on Windows or Linux.

All the best,
David Mitchell

On 7/4/2019 10:38, Ulrich Vollert wrote:
Hi David,

The file graphview.svg contains a svg-drawing: a circled letter 'a' pointing to 
a circled letter ???b' which I added to my email, but the png-image was removed 
from my email.

I assume that this svg-file is the expected answer.

So, I assume that dot is working as expected and without errors.

To answer your question completely:

The command ldd under Linux is not available on a Mac, but 'otool -L??? gives 
similar answers:

/usr/local/bin/dot:
        /usr/local/Cellar/graphviz/2.40.1_1/lib/libgvc.6.dylib (compatibility 
version 7.0.0, current version 7.0.0)
        /usr/local/opt/libtool/lib/libltdl.7.dylib (compatibility version 
11.0.0, current version 11.1.0)
        /usr/local/Cellar/graphviz/2.40.1_1/lib/libxdot.4.dylib (compatibility 
version 5.0.0, current version 5.0.0)
        /usr/local/Cellar/graphviz/2.40.1_1/lib/libcgraph.6.dylib 
(compatibility version 7.0.0, current version 7.0.0)
        /usr/local/Cellar/graphviz/2.40.1_1/lib/libpathplan.4.dylib 
(compatibility version 5.0.0, current version 5.0.0)
        /usr/lib/libexpat.1.dylib (compatibility version 7.0.0, current version 
8.0.0)
        /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 
1.2.11)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current 
version 1252.200.5)
        /usr/local/Cellar/graphviz/2.40.1_1/lib/libcdt.5.dylib (compatibility 
version 6.0.0, current version 6.0.0)

Regards,
Ulrich

Am 04.07.2019 um 14:36 schrieb David Mitchell <davidmitch...@att.net>:

Your message seems to be truncated.  Does that mean that the .svg outoput file 
was created, but is empty?

I have two other suggestions.

You could try putting a space after the -o and before the file name.

Also, you could try:

ldd /usr/local/bin/dot

to see if all needed libraries are available.

All the best,
David Mitchell
On 7/3/2019 15:51, Ulrich Vollert wrote:
The svg file contains
Am 03.07.2019 um 21:28 schrieb David Mitchell <davidmitch...@att.net>:

Hi Ulrich,

Could you please try copying and pasting the value of spawn_arg_base_ to a 
console window and running it?  You may get more interesting error messages.

Thanks,
David Mitchell

On 7/3/2019 15:08, Ulrich Vollert wrote:
graphview 'digraph G { a->b }',LF
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