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Password aging is off by default. You can use this process to turn password aging on/off, and to set the default number of days for aging.
When password aging is on:
Password aging affects all Linux and CMS users who use the /usr/bin/cms shell. However, you can exclude specific users from the password aging policy, see Excluding a user from password aging.
Non-CMS users such as root, root2, or informix do not age.
If you are using LDAP, the server running the directory service controls password aging.
When password aging is on, the system modifies the RHEL policy file /etc/passwd.