macOS / binaries /

BSD

/System/Library/CoreServices/Applications/Directory Utility.app/Contents/PlugIns/BSD.daplug/Contents/MacOS/BSD
BSD Flat File

The BSD plugin handles the flat files located in the /etc directory, such as hosts and passwd.

The binary is a part of BSD application.

source: Mac OS X For Unix Geeks: Demistifying the Geekier Side of Mac OS X, Edition 4