/usr/sbin/mrgpwd.  You must have permissions to read /etc/security/password.

------------------------------

1.138: I lost the root password, what should I do?
From: dramm@csusm.edu (Donald E. Ramm)

Boot from boot diskettes, bootable tape, or bootable CD.  
At the Installation/Maint menu select item 4, "Start a limited function
	maintenance shell.
At the subsequent "#" prompt enter the command:
	getrootfs hdiskN
	(where "N" is replaced by the number of a disk on your system
	that is in rootvg.)
That will run for about a minute or so and you get a # prompt back.  At this
	point you are logged in as root in single user mode.
Change to /etc/security and edit the passwd file.  Delete the three lines
	under root: password, update time (or whatever it's called), and
	flags.  Save the file.
Then at the prompt, give root a new password.
Shutdown/reboot in normal mode.  Log in with new password.


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