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So i have been doing research on learning pam moduel in linux system. And i come across some online resource explaining how pam moudle works. And one of the line is

account required pam_unix.so This module performs any necessary account verification. For example, if shadow passwords have been enabled, the account component of the pam_unix.so module checks to see if the account has expired or if the user has not changed the password within the grace period allowed.

And that make sense. But my question is when i tried to put password instead of account in my common-password module folder under /etc/pam.d

what does it do ? Because i put

password required pam_unix.so debug

and it is debugging for any password change operation which is good. But i have trouble understanding this module. thanks

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  • I notice that you have asked several questions by now but haven't accepted any of the answers that you have received. Consider accepting the most helpful answers to each question. Doing so will mark the issue as resolved, and it will also increase your chances of getting help in the future. See also unix.stackexchange.com/help/someone-answers
    – Kusalananda
    Jun 23 at 17:01

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