TRY INVOKING THE
mount COMMAND WITHOUT ARGUMENTS—this displays the file systems currently mounted on your GNU/Linux computer. You’ll see one line that looks like this:
none on /proc type proc (rw)
This is the special
/proc file system. Notice that the first field,
none, indicates that this file system isn’t associated with a hardware device such as a disk drive. Instead,
/proc is a window into the running Linux kernel. Files in the
/proc file system don’t correspond to actual files on a physical device. Instead, they are magic objects that behave like files but provide access to parameters, data structures, ...