How to interact with sysfs
according to the training:
sysfs is used both to gather information about the system, and modify its behavior while running. In that sense, it resembles /proc, but it is younger than and has adhered to strict standards about what kind of entries it can contain. For example, almost all pseudo-files in /sys contain only one line, or value; there are none of the long entries you can find in /proc.
how do we interact with it though?