dev_mkdb —
create /dev database
  
    | dev_mkdb | [ -c] [-odatabase] [directory] | 
The dev_mkdb command creates a
  cdbr(3) database in
  “/var/run/dev.cdb” which contains the
  names of all of the character and block special files in the specified
  directory, using the file type and the st_rdev field as
  the key. If no directory is specified, the
  “/dev” directory is used.
Keys are a structure containing a mode_t followed by a dev_t, with
    any padding zero'd out. The former is the type of the file (st_mode &
    S_IFMT), the latter is the st_rdev field.
The options are as follows:
  - -c
- Create a db(3) database for
      compatibility with libc versions and statically linked programs from
      before NetBSD 6.0. The default name is
      “/var/run/dev.db”.
- -odatabase
- Put the output databases in the named file.
  - /dev
- Device directory.
- /var/run/dev.db
- Database file.
Thedev_mkdb command appeared in
  4.4BSD.