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Script works in a Konsole / not as a cron job

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Script works in a Konsole / not as a cron job BSD Help forum discussing all BSD based operating systems including FreeBSD, OpenBSD, NetBSD, and more. BSD refers to the distribution of UNIX originally developed by the University of California at Berkeley.

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  #1  
Old August 14th, 2007, 12:36 PM
dfr574 dfr574 is offline
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Script works in a Konsole / not as a cron job
Hello,

I'm running FreeBSD 6.2 with KDE 3.5.

I wrote a small script that calls acroread to convert a PDF file to a PostScript file. The script works great if I run it in the a KDE Konsole, but if I try to set it up as a cron job I receive the following error.

Code:
(acroread:2040): Gtk-WARNING **: cannot open display:


Does anyone know any way around this??

Thanks in advance.
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  #2  
Old August 14th, 2007, 08:56 PM
jtalerico jtalerico is offline
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Since you are running this as a cron you will need to setup a virtual frame buffer to run the acroread in. Unless you can tell acroread to run headless? Well looking at acroread there is no option for headless.

So you can create a frame buffer by...
Code:
Xvfb :1 -screen 1 800x600x16 &


So now you have a virtual frame buffer that you can push applications into it.

Code:
       --screen=<SCREEN>

              X screen to use. Use this options to override the screen part of
              the DISPLAY environment variable.


acroread -screen :1 [options]


Let me know if this helps!
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  #3  
Old August 15th, 2007, 05:51 AM
dfr574 dfr574 is offline
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jtalerico,

Thanks for the reply. Please forgive me if I sound like an idiot.

If I issue this command at boot it will create the Virtual Frame Buffer, correct?
Code:
Xvfb :1 -screen 1 800x600x16 &



When do I use this? And what is <SCREEN>
Code:
--screen=<SCREEN>


The last part I understand. I'll edit my script using the following.
Code:
acroread -screen :1 [options]

At this point it isn't working for me because I don't fully understand the code.

Thanks for all of you're help.
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  #4  
Old August 15th, 2007, 06:28 AM
jtalerico jtalerico is offline
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The SCREEN is the virtual frame buffer you created to push the application to.

You need it here:

acroread -screen :1 [options]
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  #5  
Old August 15th, 2007, 07:52 AM
dfr574 dfr574 is offline
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This is what I'm typing

[mike@BSD62 ~]$ Xvfb :1 -screen 1 800x600x16 &

[mike@BSD62 ~]$ acroread -screen :1 -toPostScript -scale -80 -shrink -optimizeForSpeed ./page1.pdf
[mike@BSD62 ~]$ (acroread:801): Gtk-WARNING **: cannot open display:


Is --screen=<SCREEN> a command? Where would it go?
Thanks for your patience.
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  #6  
Old August 15th, 2007, 08:05 AM
jtalerico jtalerico is offline
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I was just showing you what the man page of acroread shows for pushing it to a different screen.

To see what i am talking about do a 'man acroread'. Maybe other versions differ?

Sure thing, let me know if you are still having problems getting it started.
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dfr574 agrees: Excellent advice.
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  #7  
Old August 15th, 2007, 09:07 AM
dfr574 dfr574 is offline
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Got it working!! Thanks for all of you help
This is what worked.

$ Xvfb :1 -screen 0 800x600x16 &
$ export DISPLAY=BSD62.1

acroread --screen=1 -toPostScript -scale -80 -shrink -optimizeForSpeed ./page1.pdf



Thanks again!! I would have never figured it out without your help.
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  #8  
Old August 15th, 2007, 12:16 PM
jtalerico jtalerico is offline
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Glad to see that bit helped!

Looks to be a lot of people on the web trying to automate things with acroread. Maybe post a how-to with what you learned on here.
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