Pluggable Authentication Modules (PAM)
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http://linux-pam.org/
https://en.wikipedia.org/wiki/Linux_PAM
https://en.wikipedia.org/wiki/Pluggable_authentication_module
https://wiki.gentoo.org/wiki/PAM
https://wiki.gentoo.org/wiki/Project:PAM
https://wiki.gentoo.org/wiki/Project:PAM/Service_files
https://wiki.archlinux.org/index.php/PAM