I cant use my variables in the next autostart


@y=`cat /proc/cpuinfo | grep Serial | cut -d ' ' -f 2`

@chromium-browser --incognito $x$y

the y variable get the serial number

When chromium opens I get %24x%24y in urll browser. What I want is https://mypage.com/#myserialnumber .

Edit 20/03/2020

First I created the file

pi@raspberrypi:~ $ touch vars.sh

Then change the file

pi@raspberrypi:~ $ nano vars.sh

y=`cat /proc/cpuinfo | grep Serial | cut -d ' ' -f 2`

I change the autostart to this

@source ~/.vars.sh
@chromium-browser --incognito $f

but the result is the same %24f in the urll browser

1 Answer 1


The autostart file does not work like that.

Instead each command runs under its own subshell simultaneously. Therefore, your chromium command doesn't know those variables even exist.

To fix:

Put those 3 commands in a bash script (*.sh) file, make it executable, and put the path to the script in your autostart file.

Example script at /home/pi/Desktop/myscript.sh:

y="$(cat /proc/cpuinfo | grep Serial | cut -d ' ' -f 2)"
@chromium-browser --incognito $x$y

To make executable, run chmod +x /home/pi/Desktop/myscript.sh in a terminal. To run on boot, put @/home/pi/Desktop/myscript.sh in the autostart file.

  • Maybe the answer is to obvious but Im totally new and everything I know is from google. I edit the question could you give me more advice please.
    – Affj
    Mar 20, 2020 at 16:51
  • That won't work either. You have to put all 3 commands in your .sh file. INCLUDING THE CHROMIUM LINE.
    – Botspot
    Mar 20, 2020 at 20:06
  • I included to the bash script chromium-browser --incognito $f but now nothing opens
    – Affj
    Mar 20, 2020 at 20:49
  • Run your script in the terminal. That way you can see any errors that show up.
    – Botspot
    Mar 20, 2020 at 23:55
  • I ran the bash script in terminal like this source vars.sh and works perfect now I only need that autostart run the code. I think the problem is in autostart @source ~/.vars.sh I created the autostart with the command sudo nano /home/pi/.config/lxsession/LXDE-pi/autostart
    – Affj
    Mar 21, 2020 at 1:41

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