set up password change regularly with certain rules

James Gray james.gray at
Mon Nov 5 11:26:03 UTC 2007

Soo-Hyun Choi wrote:
> hi,
> i wonder if there is any good way of setting up a user password change 
> regularly with applying certain rules (e.g., more than 6 letters or so). 
> the basic intention is to force a user to change his password in a 
> regular basis.

In addition to Chris Mohler's comments, have a look at 
/etc/pam.d/common-password which is heavily commented and relatively 

BEWARE! Before you decide to start modifying the values in that file, 
make sure you understand the contents.  If you follow the instructions 
in the file, you'll be fine....improvise without $CLUE and you can lock 
yourself out of your system.  Google is your friend to discover the 
black art that *is* PAM (pluggable auth modules).

YMMV and other disclaimers apply ;)

-- James

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