My Python program SimB.py runs fine if I start it with sudo python SimB.py using a keyboard attached to my BBB. So I gave crontab a try again, putting it in /etc. Here's my crontab and crontab -l which seems to say my python program is running but I don't see that it has done anything, don't see anything running on my BBB 4DCAPE screen. I saw something in the CronHowTo () page about GUI's but haven't tried that yet, figuring that I would just try to start SimB.py and see what happened. So what to do next?
Thanks in advance for help, John <https://lh3.googleusercontent.com/-xlAZ4lTfpEQ/VxcI6uzi-ZI/AAAAAAAABO8/mKaxRI5Fk7ASwto46EaSSevQlzCGjEN4gCLcB/s1600/crontab_test.png> On Sunday, April 17, 2016 at 5:55:29 PM UTC-7, Dennis Lee Bieber wrote: > > On Sat, 16 Apr 2016 20:35:44 -0700, John Baker > <john...@ieee.org <javascript:>> declaimed the following: > > >Really good idea evilwulfie. That, xwindows, sounds like the problem. > > > >Now I'm thinking that I should put a startup icon on the Debian desktop > >to start my program, since I know that I can start it with the terminal > >program with sudo python myProgram.py. That has always worked, whereas I > >cannot start it via putty which apparently requires xwindow. It doesn't > >seem like this should be so hard, but probably just hard as I am not > >knowledgeable with Linux. > > Putty does not require an X-window environment -- it's your > program > using Tkinter that needs to have an X-window environment. That is, it has > to have someplace to send the drawing commands for the GUI you want to > use. > Putty is basically a text console, it does not know X-window. (In fact, > putty is likely running on a M$ Windows box and uses the Win32 runtime -- > only text transfers between it and the BBB login) > > > http://support.objectplanet.com/esupport/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=17 > > > When you connect via keyboard and HDMI, you are running the > X-server on > localhost (the BBB). (It actually gets set up for that session on boot) > > From putty -- you'd have to have an X-server running on your M$ > Windows > box, and then issue command through putty to set the display to the > Windows > box, before starting the Tkinter program. > > > >Thanks for your suggestion, > >John > > > >On 4/16/2016 6:20 PM, evilwulfie wrote: > >> I Am saying that if your depending on the GUI for any part of your > >> program it may expect the xwindow system to be active before > >> it starts, then seeing that the GUI is not running just exits. > >> > >> It's hard to second guess what your program is doing here but it "may" > >> be the issue. > >> > >> try checking for the xwindow system being running before starting your > >> program. > >> > >> > >> > >> > >> > >> On 4/16/2016 6:16 PM, John Baker wrote: > >>> Hi Wulf Man, > >>> My GUI is part of a simulation program. There's a lot of calculation > >>> and the GUI to allow me to enter some parameters and display the > >>> results on a graph. You're saying that I have to start up my > >>> calculation part of the program and then the GUI? > >>> John > >>> > >>> On Saturday, April 16, 2016 at 5:37:07 PM UTC-7, Wulf Man wrote: > >>> > >>> If this is a GUI only program you need to start your program > >>> after the GUI is up, I don't see this check in your crontab file > >>> Been too long since i have done this but i am sure google is your > >>> friend > >>> > >>> > >>> > >>> On 4/16/2016 4:53 PM, John Baker wrote: > >>>> Hi Dieter, > >>>> Still not working. I have a hunch that the problem is with > >>>> Tkinter but can't tell. I have to run my GUI program SimB.py > >>>> with the terminal program on the BBB, typing sudo python > >>>> SimB.py, then it runs happily. > >>>> > >>>> *Here's my crontab in /etc:* > >>>> # /etc/crontab: system-wide crontab > >>>> # Unlike any other crontab you don't have to run the `crontab' > >>>> # command to install the new version when you edit this file > >>>> # and files in /etc/cron.d. These files also have username > fields, > >>>> # that none of the other crontabs do. > >>>> > >>>> SHELL=/bin/sh > >>>> PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin > >>>> > >>>> # m h dom mon dow usercommand > >>>> 17 ** * *root cd / && run-parts --report /etc/cron.hourly > >>>> 25 6* * *roottest -x /usr/sbin/anacron || ( cd / && run-parts > >>>> --report /etc/cron.daily ) > >>>> 47 6* * 7roottest -x /usr/sbin/anacron || ( cd / && run-parts > >>>> --report /etc/cron.weekly ) > >>>> 52 61 * *roottest -x /usr/sbin/anacron || ( cd / && run-parts > >>>> --report /etc/cron.monthly ) > >>>> # > >>>> @reboot root /usr/bin/python /home/debian/Desktop/SimB.py > >>>> * * * * * root /usr/bin/python /home/debian/Desktop/SimB.py > >>>> > >>>> *and here's from the syslog file that doesn't tell me anything:* > >>>> > >>>> Apr 16 23:37:01 beaglebone /USR/SBIN/CRON[2293]: (root) CMD > >>>> (sudo python /home/debian/Desktop/SimB.py) > >>>> > >>>> Apr 16 23:37:01 beaglebone /USR/SBIN/CRON[2294]: (debian) CMD > >>>> (sudo python /home/debian/Desktop/SimB.py) > >>>> > >>>> Apr 16 23:37:01 beaglebone /USR/SBIN/CRON[2295]: (root) CMD > >>>> (/usr/bin/python /home/debian/Desktop/SimB.py) > >>>> > >>>> Apr 16 23:37:14 beaglebone /USR/SBIN/CRON[2292]: (CRON) info (No > >>>> MTA installed, discarding output) > >>>> > >>>> Apr 16 23:37:14 beaglebone /USR/SBIN/CRON[2290]: (CRON) info (No > >>>> MTA installed, discarding output) > >>>> > >>>> Apr 16 23:37:14 beaglebone /USR/SBIN/CRON[2291]: (CRON) info (No > >>>> MTA installed, discarding output) > >>>> > >>>> > >>>> I can successfully run my program with a keyboard attached to my > >>>> BBB using sudo python SimB.py, have to use the sudo, otherwise > >>>> gets a Tkinter error. I just now double-checked and my GUI > >>>> program SimB.py runs very happily. Cannot run SimB.py thru putty > >>>> as it gives the Tkinter error. > >>>> > >>>> Any ideas? > >>>> Thanks, > >>>> John > >>>> > >>>> On Saturday, April 16, 2016 at 1:04:21 AM UTC-7, Dieter Wirz > wrote: > >>>> > >>>> On Sat, Apr 16, 2016 at 5:57 AM, John Baker > >>>> <bakerengi...@gmail.com>wrote: > >>>> > >>>> John Minton, > >>>> I gave crontab a try and of course it didn't work. It > >>>> seems like this should be a piece of cake to do. I > >>>> probably did something wrong. I checked the syslog and > >>>> see an error: "No MTA installed." > >>>> > >>>> > >>>> ? > >>>> If u? > >>>> ? have an error in ?crontab the crontab tries to send you an > >>>> Email... And of coarse cannot without MTA;) > >>>> > >>>> My crontab file says: > >>>> ? ? > >>>> @reboot sudo python /home/debian/Desktop/myProg.py > >>>> * * * * * sudo python /home/debian/Desktop/myProg.py > >>>> > >>>> > >>>> ? The are two crontabs, users and system crontab. > >>>> Users crontab you can change with > >>>> $ crontab -e > >>>> System crontab with > >>>> $ sudo nano /etc/crontab > >>>> > >>>> If u want to run a process as root, then best is, if u add > >>>> > >>>> @reboot root /usr/bin/python > /home/debian/Desktop/myProg.py > >>>> * * * * * root /usr/bin/python > >>>> /home/debian/Desktop/myProg.py > >>>> > >>>> to /etc/crontab > >>>> > >>>> HTH > >>>> > >>>> -- > >>>> For more options, visit http://beagleboard.org/discuss > >>>> --- > >>>> You received this message because you are subscribed to the > >>>> Google Groups "BeagleBoard" group. > >>>> To unsubscribe from this group and stop receiving emails from > >>>> it, send an email to beagleboard...@googlegroups.com > <javascript:>. > >>>> To view this discussion on the web visit > >>>> > https://groups.google.com/d/msgid/beagleboard/ad44be62-e803-43e8-b131-131d16fd92f9%40googlegroups.com. > > > >>>> For more options, visit https://groups.google.com/d/optout > >>>> <https://groups.google.com/d/optout>. > >>> > >>> > >>> < > https://www.avast.com/en-us/lp-esg-fav?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=oa-2109-v2-b> > > > >>> Virus-free. www.avast.com > >>> < > https://www.avast.com/en-us/lp-esg-fav?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=oa-2109-v2-b> > > > >>> > >>> > >>> -- > >>> For more options, visit http://beagleboard.org/discuss > >>> --- > >>> You received this message because you are subscribed to the Google > >>> Groups "BeagleBoard" group. > >>> To unsubscribe from this group and stop receiving emails from it, > >>> send an email to beagleboard...@googlegroups.com <javascript:> > >>> <mailto:beagleboard+unsubscr...@googlegroups.com <javascript:>>. > >>> To view this discussion on the web visit > >>> > https://groups.google.com/d/msgid/beagleboard/116fae1e-3ad7-4949-87ee-63a907b32cda%40googlegroups.com. > > > >>> For more options, visit https://groups.google.com/d/optout. > >> > >> > >> < > https://www.avast.com/en-us/lp-esg-fav?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=oa-2109-v2-b> > > > >> Virus-free. www.avast.com > >> < > https://www.avast.com/en-us/lp-esg-fav?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=oa-2109-v2-b> > > > >> > >> > >> -- > >> For more options, visit http://beagleboard.org/discuss > >> --- > >> You received this message because you are subscribed to a topic in the > >> Google Groups "BeagleBoard" group. > >> To unsubscribe from this topic, visit > >> https://groups.google.com/d/topic/beagleboard/ULeYE9kjqZ4/unsubscribe. > >> To unsubscribe from this group and all its topics, send an email to > >> beagleboard...@googlegroups.com <javascript:> > >> <mailto:beagleboard+unsubscr...@googlegroups.com <javascript:>>. > >> To view this discussion on the web visit > >> > https://groups.google.com/d/msgid/beagleboard/5712E4F6.4030708%40gmail.com > >> < > https://groups.google.com/d/msgid/beagleboard/5712E4F6.4030708%40gmail.com?utm_medium=email&utm_source=footer>. > > > >> For more options, visit https://groups.google.com/d/optout. > -- > Wulfraed Dennis Lee Bieber AF6VN > wlf...@ix.netcom.com <javascript:> HTTP://wlfraed.home.netcom.com/ > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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