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How does one set the password expiration parameters on CentOS or Red Hat Linux using PAM? Specifically, I need to set the following:

  1. Maximum number of days that a password may be used.
  2. Minimum number of days allowed between password changes.
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There is a file that will do this: /etc/login.defs. Two values you want to look to change here:

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the parameters you are searching for are:

you'll find a more detailed explanation and some other hints here.

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