Unable to execute a script at boot-up

[BIZDIK]

Hello folks!

I created a simple script as shown below, and named it “keyboard_backlight.sh”

#!/bin/bash
echo '3-12' |sudo tee /sys/bus/usb/drivers/usb/unbind

To give executable permissions, I executed the command below.

sudo chmod 775 keyboard_backlight.sh

In order to execute the script (keyboard_backlight.sh) at boot-up, I ran the command below.

crontab -e

And entered the command below in crontab

@reboot /home/bizdik/keyboard_backlight.sh

But the script (keyboard_backlight.sh) doesn’t get executed at boot-up. When I manually execute the script in terminal, it works fine! I don’t understand why it doesn’t work at boot-up. Any idea?

Doesn’t crontab in Manjaro support “@reboot” entry (function)? Just wondering!!?

Any help is greatly appreciated! Thank you!

[dmt]

It’s been a long time since I used crontab. Perhaps a systemd service would suffice.

# /etc/systemd/system/keyboard-backlight.service
[Unit]
Description=Run keyboard_backlight.sh

[Service]
Type=oneshot
ExecStart=/usr/local/bin/keyboard_backlight.sh

[Install]
WantedBy=default.target

The script will not need sudo, and should be put in /usr/local/bin, if you put it elsewhere then change the path in the service file.

#!/bin/bash
echo '3-12' > /sys/bus/usb/drivers/usb/unbind

Then enable it.

sudo systemctl enable keyboard-backlight.service

EDIT:

@BIZDIK

And entered the command below in crontab

@reboot /home/bizdik/keyboard_backlight.sh

/home may not be mounted yet by the time the script is run, so perhaps just put the script in a sensible place, such as /usr/local/bin.

https://wiki.archlinux.org/title/Systemd
https://wiki.archlinux.org/title/Cron

[BIZDIK]

Thank you so much for your help, dmt! The systemd service did the trick! Thank you for the service file and also for making things so easy to understand.

After a long struggle and months of research, the keyboard backlight of my laptop (MSI GS76) finally works with Manjaro! And with your help, I was able to run the script at boot-up to automatically turn on the keyboard backlight.

Cheers!

[dmt]

You’re welcome, glad I could help.