'How can I start a bash script 20 seconds after startup?

I got a bash script that stops a program, mounts the pi and starts the program again. I would like to start it on startup, but after the program itself started. So my idea was to simply wait some time (20 or 30 seconds) and start the script then (task.sh). Any idea how I can do that? Or any other idea how to solve this? (let the script wait for the program to start won't work i guess, cause then the script would restart after the program is restarted, right?)

Thanks and Greetings, Elias

pythonbashraspberry-piraspberry-pi3autostart


Solution 1:[1]

Assuming that you are using a Debian / Debian derivative distro (Ubuntu / Mint / Etc) here's how to achieve the result you look for.

Create your script in the path you've suggested using any text editor (here I use the simple nano):

nano /home/pi/task.sh

Paste into your task.sh:

sleep 40
/home/pi/pi_video_looper/disable.sh
mount -a
/home/pi/pi_video_looper/install.sh

Make the script executable:

chmod +x /home/pi/task.sh

Make sure the script works running it:

/home/pi/task.sh

Once you're sure that the script works fine edit your rc.local:

sudo nano /etc/rc.local

A key concept here is that whatever you put in rc.local will be executed with root permissions.
For this reason there is no need to use sudo.

Add before exit 0 the following:

/home/pi/task.sh

Reboot and test

Solution 2:[2]

Thanks for all the help, but I solved it myself following this tutorial:

create a new file in /etc/init.d/, I'll call it example in this.

So:

sudo nano /etc/init.d/example

This will be a file that will be executed after raspberry pi startup. The code for this file is the following:

#!/bin/sh
### BEGIN INIT INFO
# Provides:          Für welches Programm ist das Script?
# Required-Start:    
# Required-Stop:     
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Kurze Beschreibung
# Description:       Längere Beschreibung
### END INIT INFO
 
# Actions
case "$1" in
    start)
        # START
        ;;
    stop)
        # STOP
        ;;
    restart)
        # RESTART
        ;;
esac
 
exit 0

Because I wanted this script to start /home/pi/task.sh at startup and reboot, I simply put /home/pi/task.sh before the ;; after # START and # RESTART

If you've done that, save it and exit it. Then type

sudo chmod +x /etc/init.d/example

to make the script executable. The last step is to define the runlevels:

sudo update-rc.d example defaults

After that you can reboot and see if it works.

I hope that made it clear for everyone :)

(And just for me: https://jankarres.de/2014/07/raspberry-pi-autostart-von-programmen-einrichten/ :D)

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1
Solution 2 David Z

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