The kernel mounts the filesystem sysfs under/sys and makes information about the devices and drivers available.


Historically stuff originally found under/proc got and will get moved to sysfs to clean procfs from device and hardware related stuff.

udev makes heavily use of sysfs since it creates the /dev files using information from /sys.

The files under /sys contain just one value. The meaning of the value can be extracted from the path and filename.

As app-text/tree shows the devices are grouped in tree -L 1 shows the directories

block, bus, class, dev, devices, firmware, fs, kernel, module, power

Since many files might be put in more than one directory, sysfs make heavily use of symbolic links to have the data consistent.

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