As an AIX/UNIX Administrator, there will be times where you will want to require a user to change their password at next login.
A great example of this is after setting up a new user with a generic password.
To require or force a user to change their password at next or even their first login, login as root or use sudo to run the following command:
pwdadm -f ADMCHG username
Substitute username with the actual user’s name of course.
At the user’s next login, they will be required to enter their current password and set a new password.