Virtual file systems

Linux

Linux has many optional virtual file systems. Three of them however, are almost allways required:

• The devtmpfs, mounted at /dev
  this filesystem contains device nodes dynamically populated by the Kernel, most of them correspond to single hardware devices, like keyboards, partitions and GPUs.
• The procfs, mounted at /proc
  here, information about the system can be queried and set, ranging from the hostname to PIDs.
• The sysfs, mounted at /sys
  can be seen as an extended to procfs containing more runtime and hardware information.

Symlink at least the source directories corresponding to those to the system configuration directory. All other virtual file systems are optional. A list of ready to use source directories can be found at the goetia-linux page.

FreeBSD

FreeBSD on the other hand needs just the /dev virtual file system. A ready to use oneshot source directory is available at goetia-freebsd.