Forcing users to use unique passwords?

Scott Schappell archon-sender-7e5359 at
Tue Aug 19 13:30:26 PDT 2003

I've did a google search on this, and an archive search. For an extra
measure of completeness, I scanned the handbook. 

Here's the question:

I currently make my users reset their passwords every 90 days. 
However, nothing stops them from reusing the same password. passwd 
happily allows users to reuse a password. Since that's the case,
what's the point of enabling password expiration, since most users
will probably reuse their password (after all, it's convenient to do

Is there a way to change login.conf to force unique passwords?  Or
would I have to wrap passwd in a shell script of some sort?

Thanks in advance for your help!
PGP Key:
"Compassion and retribution are two sides of the same coin. Necessity
dictates on what side the coin will fall."

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