User Authentication HOWTO | 2.1. /etc/passwd
The /etc/passwd file, which contains information about all users, including their encrypted password, is readable by all users, making it possible for any user to get the encrypted password of everyone on...
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passwd_compat, group_compat and shadow_compat are only supported by glibc 2.x. If the NIS accounts are stored in /etc/passwd, the following is a good starting point for a working configuration
Essential | etc/master.passwd (FreeBSD)
User Accounts. /etc/passwd. The password file. This file, which serves as both passwd and shadow files, uses three additional fields between the GID and user information fields