From man passwd --
-e This is a quick way to expire a password for an account. The user will... [by AlanBartlett]
I am unable to change my password even in root (recovery mode), or to unlock it. I can still access my account, but without password protection.
I want to enforce some rules for password. So i changed, /etc/pam.d/passwd file.
/etc/pam.d/passwd - content
# The PAM configuration file for the Shadow `passwd' service
password requisite pam_passwdqc.so min=12,10,10,8,6 retry=3
Then when i try to change password with "passwd" it says module is unknwon.