2

In the crontab -u pi -e of my digital picture frame I have got two processes.

The first one calls feh on reboot and starts a slide show.

@reboot bash /home/pi/ledslide1.sh >> /home/pi/logs/slidelog 2&>1

And then other instances should be started at certain times.

15 8 * * * bash /home/pi/ledslide2.sh >> /home/pi/logs/slidelog 2&>1
15 9 * * * bash /home/pi/ledslide3.sh >> /home/pi/logs/slidelog 2&>1
...

But the feh slide show is running on repeat. That way I have to kill the process first right? timeout is not working, because I don’t know when the reboot takes place?

  • You would have to alter your scripts to save a PID (process ID) to a file. And then have other scripts check if that PID by killing the older PID or whatever else you feel would need to be done. – Giacomo1968 Sep 13 '15 at 17:30
  • 1
    Thank you @JakeGould. Your comment gave me the idea for my answer (see below). – Markus Sep 13 '15 at 18:48
  • Happy to have helped! – Giacomo1968 Sep 13 '15 at 20:51
2

In your ledslide.sh scripts, just use pkill -9 feh to kill feh. No need to keep track of PIDs or anything. pkill is used to search for and kill processes with a given name. I suggesting reading the manpage for pkill and pgrep.

  • I did put this command in the crontab. But it is more or less the same? – Markus Sep 13 '15 at 18:50
  • Yeah this would work. But what if there is more than one instance of running? A PID would ensure only the feh connected to the PID would be affected. Might seem like a minor concern but worth mentioning. – Giacomo1968 Sep 13 '15 at 19:03
  • Yes, thank you. I will take that into account. – Markus Sep 13 '15 at 21:34
1

This has worked for me so far:

@reboot bash /home/pi/ledslide1.sh >> /home/pi/logs/slidelog 2&>1
15 8 * * * pkill -9 feh && bash /home/pi/ledslide2.sh >> /home/pi/logs/slidelog 2&>1

The .sh file invokes feh and puts it into the background. pkill -9 [KEYWORD] closes the feh process.

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