command loop in sh script

Question

I'm creating a sh script on my raspberry for a timelapse. I've included in the script 4 command that will successively take place, each command tested and working. Now my question is: how to come back to the first command after the last one, indefinitely?

#!/bin/bash

sudo raspistill -w 1024 -h 768 -o /home/pi/timelapse/a%04d.jpg -t 600000 -tl 30000
sudo kill $(ps ax | grep 'timelapse' | awk '{print $1}')
sudo avconv -r 10 -i /home/pi/timelapse/a%04d.jpg -r 10 -vcodec libx264 -crf 20 -g 15 timelaps$
sudo rm /home/pi/timelapse/*.jpg

So after sudo rm /home/pi/timelapse/*.jpg I want to go back to the first command.

Would you have any idea?

thanks.

Answer 1

You can use a loop:

#!/bin/sh

while true; do 
    ...
done

or, re-invoke the script:

#!/bin/sh

...

exec $0 "$@"

Frankly, either one of these seems risky in your case since you're doing no error checking at all, and you run the risk of entering a relatively fast loop of commands continuously failing. At the very least, you should pause for a bit by using while sleep 1; instead of while true;