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From the modprpw man page, no aging is present if the following 4 parameters are set zero

• mintm
  • mintm=value database u_minchg=(value*86400).Set the minimum time interval between
    password changes (days). 0 = none. Same as
    non-trusted mode minimum time
• exptm
  • exptm=value database u_exp=(value*86400).Set password expiration time interval (days).
    0 = not expired. Same as non-trusted mode
    maximum time.
• expwarn
  • expwarn=value       database u_pw_expire_warning=(value*86400).
• lftm
  • lftm=value database u_life.Set password life time interval (days). 0 =
    infinite

How to disable  password  expiration on  hp-ux ?

• In Trusted  Systems
  • # /usr/lbin/modprpw -l -m mintm=0,exptm=0,expwarn=0,lftm=0 <USER-ID>

# /usr/lbin/modprpw -l -m mintm=0,exptm=0,expwarn=0,lftm=0  usrcntrl

• In  Non-Trusted  Systems
  • passwd -x -1 <USER-ID>

#passwd -x -1 usrcntrl