This module saves the last passwords for each user in order to force password change history and keep the user from alternating between the same password too frequently.
This module does not work together with kerberos. In general, it does not make much sense to use this module in conjunction with NIS or LDAP, since the old passwords are stored on the local machine and are not available on another machine for password history checking.
When password changing enforce the module to use the new password provided by a previously stacked
module (this is used in the example of the stacking of the
module documented below).
If this option is set, the check is enforced for root, too.
passwords for each user are saved in
/etc/security/opasswd. The default is
Prompt user at most
times before returning with error. The default is