/dev
Device directory.
Create /dev database
dev_mkdb
The dev_mkdb command creates a db(3) hash access method database in “/var/run/dev.db” which contains the names of all of the character and block special files in the “/dev” directory, using the file type and the st_rdev field as the key.
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.
/dev
Device directory.
/var/run/dev.db
Database file.
Unchanged in 163 releases since Mac OS X 10.0.