Linux System Administration
Filesystems
Special Purpose Filesystems
proc
Short for "process", mounted on /proc
Each numbered directory represents a current process.
The files in these directories represent various aspects of the processes.
This filesystem contains a great deal of additional kernel and hardware information.
usbdevfs
mounted on /proc/bus/usb
Programs that interact with the USB interface and its devices often need the files here.
The files contain information on the bus status.
tmpfs
mounted on /dev/shm
This allows you to use physical memory and swap space as temporary storage.
Be careful here as you don't want to overload this filesystem as you will quickly run out of system resources.
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