I have found out that brightness can be controlled from a file /dev/class/backlight/intel_backlight/brightness. I am looking for a similar file from where I can change system volume ( sound ). I am not looking for a terminal command like given in the post at Terminal command to set audio volume? but looking for the file that is changes by it (where it records the sounds info)
I am using Ubuntu 16.04, my laptop is hp-pavillion.