https://www.cyberciti.biz/faq/understanding-etcpasswd-file-format/
http://www.yourownlinux.com/2015/07/etc-passwd-file-format-in-linux-explained.html
man passwd (HPUX)
On a non-shadowed standard system, all password fields contain the actual encrypted password.
On a shadowed standard system, all password fields contain an `x', while the actual encrypted passwords reside in /etc/shadow.
On a trusted system, all password fields contain a `*' and the actual encrypted passwords reside in the Protected Password Database.
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