My original question is about password change . In my first mail I 
mentioned that when 
I attempt to login into my sun running solaris 2.5.1, a prompt tell me 
my password has
been expired, and should to be changed . And I checked the 
/etc/default/passwd and 
/etc/passwd file , and I found nothing about password expiration . At 
this mail I forgot to 
mention I have also checked the /etc/shadow file , so everyone advised 
that I should 
check the /etc/shadow file.  Then my second mail point out that I have 
checked the 
/etc/shadow file also , then there is just one mail from 
Juergen.Schultz@fh-zwickau.de
said : " There is something like password aging which is in control by 
the admins, so, 
there must not be a parameter, but a script forcing you to change a 
aged password to
secure your system a little bit more."  I am sure a password aging 
should do just that , but 
I don't remember I had installed such a program . 
More information/advice/clue will be welcome . 
thanks
likun@bjaimail.asiainfo.com