Linux version 2.6.9-34:where are the old passwords stored?

[liuruihong]

/etc/pam.d/passwd

password required pam_cracklib.so retry=3 type=liuruihong dcredit=-3

password required pam_unix.so use_authtok

 

I want to know where the old passwd of normal account passwords stored,I
find the /etc/security/opasswd file is null.

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