Mounts the fdesc filesystem in /dev. It contains the fd subdirectory, which contains one entry for each file descriptor held open by the process reading the contents of the directory. It also contains stdin, stdout, and stderr, which are symlinks to fd/0, fd/1, and fd/2, respectively; and tty, a reference to the controlling terminal for the process.
Takes -o options as listed in the mount manpage. Normally includes the union option, which prevents mounting over and obscuring the devfs filesystem in /dev.
The directory on which the filesystem is mounted, normally /dev.