I'd like to always give my user the permission to write on a specific file located in the /sys folder.
This because in the solution I posted here I have the problem that every time I reboot I have to reset the permission on the file with chmod.
I tried to follow this guide but it didn't work. According to this I have to create a sh script, mine consiste in just this line:
/bin/chmod 644 /sys/class/leds/asus::kbd_backlight/brightness