Resetting a user password from the command line

First, login as root or an admin group user.  To prompt for and set a local user's password, use the /etc/scripts/user-mod command. For example, to change operator1's password:

/etc/scripts/user-mod -P operator1

This command also works to reset the root user's password.

Full details on managing local users from the CLI, including setting passwords non-interactively (e.g. for automated scripting), can be found in the article Managing local users from the command line.