NAME pam_pwhistory - PAM module to remember last passwords SYNOPSIS pam_pwhistory.so [debug] [use_authtok] [enforce ... password history /etc/security/pwhistory.conf Config file fo…helper program for the pam_pwhistory module that transfers password hashes from passwd or shadow ... data format are internal to the pam_pwhistory module and it should not be calle…passwords. Instead of this option the pam_pwhistory module should be used. shadow