Great question — answering as the UphillTech team:
In freeBSD password and user related information are stored as blow. /etc/master.passwd the user database. Its equivalent for /etc/shadow of Linux /etc/passwd a Version 7 format password file. Same as /etc/passwd of Linux /etc/passwd.XXXXXX temporary copy of the password file
Full answer by Kannan Mohan: https://superuser.stackexchange.com/a/476850 (CC BY-SA 3.0).
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