At the end of the section, The Switch File and Password Information, the following text should be added:
Avoid maintaining multiple repositories for the same user. By maintaining centralized password management in a single repository for each user, you reduce the possibilities of confusion and error. If you choose to maintain multiple repositories per user, update password information by using the passwd -r command.
passwd -r repository |
If no repository is specified with the -r option, passwd updates the list of repositories in nsswitch.conf in reverse order.